#include <stdio.h>
#include <stdlib.h>

int main(){

    char str1[256] = { 0 };
    char str2[256] = { 0 };
    int x, y;
    char c = 0;
    fscanf(stdin, "%255s", str1);
    if ((sscanf(str1, "(%d%c", &x, &c) == 2) && (c == ')')){
        printf("It is a number\n");
    } else if ((sscanf(str1, "[%d%c", &x, &c) == 2) && (c == ']')){
        printf("It is a number\n");
    } else {
        printf("It is NOT a number\n");
    }

    return 0;
}