#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <ctype.h>

#define LINE_SIZE 150

int main() {
    char znaky[LINE_SIZE];
    char* r = NULL;
    int symbol[LINE_SIZE];
    int sym = 0;
    char* koniec_cisla = NULL;
    char* zaciatok_cisla = znaky;
    //char* koniec_pola;
    float cislo = 0.0;
    float a = 0;
    float b = 0;
    float c = 0;
    int counter = 0;
    float sr= 0;
    int p = 0;
    while ((r = fgets(znaky, LINE_SIZE, stdin)) != NULL) {
	if(znaky[0] == '\n'){
	break;
	}
	for (int i = 0; i < strlen(znaky); i++) {  
	if (znaky[i] == '*' || znaky[i] == '/' || znaky[i] == '+' || znaky[i] == '=') {
                symbol[sym] = znaky[i];
                znaky[i] = ' ';
                sym++;
        }
		if(znaky[i] == '-'){
			if(znaky[i - 1] == ' ' && znaky[i + 1] == ' '){
			symbol[sym] = znaky[i];
			znaky[i] = ' ';
			sym++;
			}
		}
        }
        zaciatok_cisla = znaky;
        while (*zaciatok_cisla != '\0') {
            cislo = strtof(zaciatok_cisla, &koniec_cisla);
            if (zaciatok_cisla == koniec_cisla) {
                zaciatok_cisla++;
            } else {
                if(counter == 0){
		a = cislo;
		}
		if(counter == 1){
		b = cislo;
		}
		if(counter == 2){
		c = cislo;
		}
		counter++;
		//printf("Nasiel som cislo %f\n", cislo);
                zaciatok_cisla = koniec_cisla + 1;
            }
        }
	counter = 0;
	for(int j = 0; j < sym; j++){
	if(symbol[j] == '=')
	p = j;
	}
	printf("%d", sym);
        if(sym == 1){
		//printf("a--->>%f\n", a);
		//printf("b--->>%f\n", b);
		b = b * -1;
		sr = a - b;
	//printf("%f", sr);
	}
     else{
	if(symbol[p - 1] == '+'){
	sr = a + b; 
	//printf("%2.f", sr);
	}
	if(symbol[p - 1] == '-'){
	sr = a - b; 
	//printf("%2.f", sr);
	}
	if(symbol[p - 1] == '*'){
	sr = a * b; 
	//printf("%2.f", sr);
	}
	if(symbol[p - 1] == '/'){
	sr = a / b; 
	//printf("%2.f", sr);
	}
     }
	sr = roundf(sr * 100) / 100;
	if(c == sr){
	printf("OK\n");
	}
	else{
	printf("ZLE\n");
	}
	sym = 0;
    }
    if (feof(stdin)) {
        //printf("Dostal som sa na koniec suboru\n");
    }
    
    return 0;
}