#include <stdio.h>

int main()
{
	int x[26] = { 0, };
	int index;
	char string[10] = "abcdef";

	for (int i = 0; i < 10; i++)
	{
		index = string[i] - 97;
		x[index]++;
	}

	for (int i = 0; i < 26; i++)
	{
		printf("%c : %d\n", i+97, x[i]);
	}
	return 0;
}