Буквы

#include <iostream>

using namespace std;

int main() {
    char s[100];
    int a[26];
    cin.getline(s, 100);
    _asm {

        lea esi, a
        mov ecx, 26
_loop:
        mov dword ptr [esi], 0
        add esi, 4
        loop _loop

        lea esi, s
        xor ecx, ecx
_loop1:
        cmp byte ptr [esi], 0
        je _end
        mov cl, byte ptr [esi]
        sub cl, 'a'
        inc a[ecx * 4]
        inc esi
        jmp _loop1
_end:
    }
    for (int i = 0; i < 26; ++i)
        cout << (char)('a' + i) << " " << a[i] << endl;
    return 0;
}