#include<iostream>

using namespace std;

int main(){
    int daxie=65,xiaoxie=97;
    while (daxie != 91 and xiaoxie != 123)
    {
        char daxie_1 = daxie;
        char xiaaoxie_1 = xiaoxie;

        cout <<daxie_1<<xiaaoxie_1;

        daxie++;
        xiaoxie++;
    }
    
    
    return 0;
}