c++ 행맨만드는중입니다. 소스좀 봐주세요 너무 답답합니다.

#include
#include
#include
using namespace std;

int main()
{
char answer,typing;
srand((unsigned) time(NULL));
int a=rand()%52;
int wrong=0, score=0;
char alpha[10]={'_','_','_','_','_','_','_','_','_','\0'};
string words[] =
{
"ball", "book", "train", "bike", "rain", "car", "truck", "boat", "plane", "baby",
"spoon", "shoes", "shirt", "pants", "hat", "star", "flower", "house", "tree", "brush",
"towel", "chair", "table", "bed", "blanket", "light", "cookie", "cheese", "apple", "banana",
"candy", "milk", "juice", "water", "dog", "cat", "fish", "bird", "duck", "cow",
"horse", "bear", "pig", "lion", "elephant", "zebra", "monkey", "chicken", "butterfly", "bee",
"frog", "snake"
};
for(;;)
{
cout << words[a]<<"\n";
system("cls");
switch(words[a].size())
{
case 3:
cout << alpha << "\b\b\b\b\b\b"<<" (3글자 입니다)"< break;
case 4:
cout << alpha << "\b\b\b\b\b"<<" (4글자 입니다)"< break;
case 5:
cout << alpha << "\b\b\b\b"<<" (5글자 입니다)"< break;
case 6:
cout << alpha << "\b\b\b"<<" (6글자 입니다)"< break;
case 7:
cout << alpha << "\b\b" <<" (7글자 입니다)"< break;
case 8:
cout << alpha << "\b" << " (8글자 입니다)"< break;
case 9:
cout << alpha <<" (9글자 입니다)" << endl;
break;
}


switch(wrong)
{
case 1:
cout << "\n\n\n\n\n\n\n-+----\n";
break;

case 2:
cout << "\n |\n |\n |\n |\n |\n |\n-+----\n";
break;

case 3:
cout << "\n +---\n |\n |\n |\n |\n |\n |\n-+----\n";
break;

case 4:
cout << "\n +---\n | |\n |\n |\n |\n |\n |\n-+----\n";
break;

case 5:
cout << "\n +---\n | |\n | O\n |\n |\n |\n |\n -+----\n";
break;

case 6:
cout << "\n +---\n | |\n | O\n | |\n | |\n |\n |\n -+----\n";
break;

case 7:
cout << "\n +---\n | |\n | O\n | -|\n | |\n |\n |\n-+----\n";
break;

case 8:
cout << "\n +---\n | |\n | O\n | -|-\n | |\n |\n |\n-+----\n";
break;

case 9:
cout << "\n +---\n | |\n | O\n | -|-\n | |\n | /\n |\n-+----\n";
break;

case 10:
cout << "\n +---\n | |\n | O\n | -|-\n | |\n | //\n |\n-+----\n";
break;

}

cout << "알파벳을 입력하시오 : ";
cin >> typing;
if(typing>=65 && typing<=90)
typing=typing+32;

if(typing==words[a][0] && alpha[0] == '_'){
score++;
alpha[0]=typing;
}
if(typing==words[a][1]&& alpha[1] == '_'){
score++;
alpha[1]=typing;
}
if(typing==words[a][2]&& alpha[2] == '_')
{
score++;
alpha[2]=typing;
}
if(words[a].size()>=4 && typing==words[a][3]&& alpha[3] == '_')
{
score++;
alpha[3]=typing;
}

if(words[a].size()>=5 && typing==words[a][4]&& alpha[4] == '_')
{
score++;
alpha[4]=typing;
}

if(words[a].size()>=6 && typing==words[a][5]&& alpha[5] == '_')
{
score++;
alpha[5]=typing;
}
if(words[a].size()>=7 && typing==words[a][6]&& alpha[6] == '_')
{
score++;
alpha[6]=typing;
}
if(words[a].size()>=8 && typing==words[a][7]&& alpha[7] == '_')
{
score++;
alpha[7]=typing;
}
if(words[a].size()>=9 && typing==words[a][8]&& alpha[8] == '_')
{
score++;
alpha[8]=typing;
}

if(!(typing==words[a][0]
|| typing==words[a][1]
|| typing==words[a][2]
|| (words[a].size()>=4 && typing==words[a][3])
|| (words[a].size()>=5 && typing==words[a][4])
|| (words[a].size()>=6 && typing==words[a][5])
|| (words[a].size()>=7 && typing==words[a][6])
|| (words[a].size()>=8 && typing==words[a][7])
|| (words[a].size()>=9 && typing==words[a][8]) ) )
wrong++;



if(score == words[a].size() )
{

cout << "정답입니다\n";

cout << "계속하시겠습니까? (y/n) : ";
cin >> answer;

if(answer=='y')
{
srand((unsigned) time(NULL));
a=rand()%52;
for(int i=0; i<9; i++)
{
alpha[i]='_';
}
wrong=0, score=0;
continue;
}
else if(answer=='n')
break;
}

if(wrong==10)
{
cout<<"다시하시겠습니까?(y/n)";
cin >> answer;
if(answer=='y')
{score = 0;
continue ;
}
else if(answer=='n')
break;
}
}

return 0;
}

이게 소스입니다.

제가 제일 궁금한점은 랜덤단어의 마지막 타이핑을 입력했을때 빈칸이 안채워지는점과
해당단어가 다틀려서 그림10번이 안띄워지는점입니다.