UVa 11577 Letter Frequency

#include <iostream>
#include <string>
using namespace std;

int main() {
    int T, i, max;
    string line;
    cin >> T;
    while(T--) {
        int Alpha[26] = {0};
        cin.sync();
        getline(cin, line);
        for(i = 0; line[i]; i++) {
            if(line[i] >= 65 && line[i] <= 91)
                Alpha[line[i] - 65]++;
            else if(line[i] >= 97 && line[i] <= 122)
                Alpha[line[i] - 97]++;
        }
        for(i = 1, max = 0; i < 26; i++)
            max = (Alpha[i] > Alpha[max]) ? i : max;
        for(i = 0; i < 26; i++) {
            char ch = i + 97;
            if(Alpha[i] == Alpha[max]) cout << ch;
        }
        cout << endl;
    }
    return 0;
}