pat乙1076 wifi密碼

#include<iostream>
using namespace std;
int main()
{
    int i,n;
    string str1,str2,str3,str4,answer;
    char right;
    cin>>n;
    for(i=0;i<n;i++)
    {
        cin>>str1>>str2>>str3>>str4;
        if(str1[2]=='T')right=str1[0];
        if(str2[2]=='T')right=str2[0];
        if(str3[2]=='T')right=str3[0];
        if(str4[2]=='T')right=str4[0];
        if(right=='A')answer=answer+'1';
        else if(right=='B')answer=answer+'2';
        else if(right=='C')answer=answer+'3';
        else if(right=='D')answer=answer+'4';
    }
    cout<<answer<<endl;
    return 0;
}