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Many Chefs- MANYCHEF

Problem Link

#include <iostream>
#include <cstdio>
#include <cstring>

using namespace std;

int main()
{
    int t, index;
    char S[2014];

    cin >> t;
    while(t--)
    {
        scanf("%s", S);

        int len = strlen(S);
        int i;

        for(i = len - 4; i >= 0; i--)
        {
            if(!(S[i]=='C' || S[i]=='?')) continue;
            if(!(S[i+1]=='H' || S[i+1]=='?')) continue;
            if(!(S[i+2]=='E' || S[i+2]=='?')) continue;
            if(!(S[i+3]=='F' || S[i+3]=='?')) continue;
            S[i] = 'C';
            S[i+1] = 'H';
            S[i+2] = 'E';
            S[i+3] = 'F';
        }

        i = 0;
        while(i < len)
        {
            if(S[i] == '?')
                S[i] = 'A';
            i++;
        }
        cout << S << endl;
    }
    return 0;
}

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