> #include<iostream>
> #include<cstring>
> using namespace std;
> int main()
> {
> 	int n,b[10],i,j,k,t,len,x,z;
> 	char d[10];
> 	scanf("%d",&n);
> 	for(i=1;i<=4;i++)
> 	{
> 		int sum=0,s;
> 		scanf("%s",d);
> 		len=strlen(d);
> 		for(j=len-1;j>=0;j--)
> 		{
> 			if(d[j]>='0'&&d[j]<='9')
> 			{
> 				b[j]=d[j]-'0';
> 				if((len-j)%3==1)
> 					sum+=b[j]*9;
> 				if((len-j)%3==2)
> 					sum+=b[j]*3;
> 				if((len-j)%3==0)
> 					sum+=b[j]*7;
> 			}
> 			else 
> 			{
> 				t=j;
> 				if((len-j)%3==1)
> 					z=9;
> 				if((len-j)%3==2)
> 					z=3;
> 				if((len-j)%3==0)
> 					z=7;
> 			}
> 		}
> 		for(x=0;x<=9;x++)
> 		{					
> 			s=sum;
> 			s+=x*z;
> 			if(s%10==0)
> 				break;
> 		}
> 		cout<<"Scenario #"<<i<<":"<<endl;
> 		for(k=0;k<len;k++)
> 		{
> 			if(k==t)
> 				printf("%d",x);
> 			else
> 				printf("%d",b[k]);
> 		}
> 		cout<<endl<<endl<<endl;
> 	}
> 	return 0;
> }
> 
test case is not 4, but n
for (i = 1; i<= n ; i++)