#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
int main(void)
{
    int c;
    int counts[26] = {0};
    c = getchar();
    while (c != EOF) 
    {
         if (isalpha(c))
            counts[(toupper(c)-'A')]++;
         c = getchar();
    }
 
    for (unsigned int i = 0; i < sizeof(counts)/sizeof(counts[0]); i++) 
    {    
        if (counts[i] !=0 )
            printf("%c: %d\n", 'A'+i, counts[i]);
    }
 
    return EXIT_SUCCESS;
}

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VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZy4=

The quick brown fox jumps over the lazy dog.