Half Pyramid of Alphabets

A
B B
C C C
D D D D
E E E E E

#include <stdio.h>

int main() {
  int i, j;
  char input, alphabet = 'A';
  printf("Enter an uppercase character you want to print in the last row: ");
  scanf("%c", &input);
  for (i = 1; i <= (input - 'A' + 1); ++i) {
    for (j = 1; j <= i; ++j) {
      printf("%c ", alphabet);
    }
    ++alphabet;
    printf("\n");
  }
  return 0;
}