C :

#include <stdio.h>

int isCharacter(char *p) {
    if ((*p >= 'a' && *p <= 'z') || (*p >= 'A' && *p <= 'Z')) {
        return 1;
    }else {
        return 0;
    }
}

int isSpace(char *p) {
    if (*p == 0x20) {
        return 1;
    }else {
        return 0;
    }
}

int isNumber(char *p) {
    if (*p >= 0x30 && *p <= 0x39) {
        return 1;
    }else {
        return 0;
    }
}

int main() {
    char ch;
    int n_ch, n_sp, n_num, n_other;
    n_ch = n_sp = n_num = n_other = 0;
    while ((ch = getchar()) != '\n') {
        if (isCharacter(&ch)) {
            n_ch ++;
        }else if (isSpace(&ch)) {
            n_sp ++;
        }else if (isNumber(&ch)) {
            n_num ++;
        }else {
            n_other ++;
        }
    }
    printf("%d\n%d\n%d\n%d\n", n_ch, n_sp, n_num, n_other);
    return 0;
}