#include <stdio.h>
#include <ctype.h>
#define COD_ID 7

int verificaCodigo(char nome[]){
    int i, flag=1;

        for(i=0;i<COD_ID;i++){
        if(i<3){
            if(!isalpha(nome[i])){
                flag=0;
                break;
            }
        }else{
            if(!isdigit(nome[i])){
                flag=0;
                break;
            }
        }
    }

    return flag;
}

int main(int argc, char *argv[]) {
    printf("%d\n", verificaCodigo("ABC1234")); //1
    printf("%d\n", verificaCodigo("1BC1234")); //0
    printf("%d\n", verificaCodigo("AB11234")); //0
    printf("%d\n", verificaCodigo("QQQ9999")); //1
    printf("%d\n", verificaCodigo("123ABCD")); //0
    printf("%d\n", verificaCodigo("abc1234")); //1
    printf("%d\n", verificaCodigo("aBc9999")); //1
    printf("%d\n", verificaCodigo("a0b1234")); //0
	return 0;
}