#include <iostream>
using namespace std;

int MAX = 100;

int main() {
  
  for(int i=0; i<MAX; i++){
    cout << char('a'+ (i % 26)) << ':' << i << endl;
    // the percent sign is the "modulus," meaning it gives you the
    // remainder when you devide two things: e.g. 26 % 5 = 1 because
    // the remainder when you divide 26 by 5 is 1.
  }

  return 0;
}