#include <stdio.h>
int main() {
  int i, j;

  // Number of rows
  int rows = 3;

  // Taking first character of alphabet
  // which is useful to print pattern
  char character = 'A';

  // This loop is used to identify
  // number rows
  for (i = 0; i < rows; i++) {
    // This for loop is used to
    // identify number of columns
    // based on the rows
    for (j = 0; j <= i; j++) {
      // Printing character to get
      // the required pattern
      printf("%c ", character);

      // Incrementing character value so
      // that it will print the next character
      character++;
    }
    printf("\n");
  }
  return 0;
}