#include <stdio.h>
int main(){
    int a,b,c
    scanf("%d %d %d", &a, &b, &c);
    if (a <= 0 || b <=  0 || c <= 0){
        printf("Invalid Input");
    }

    else if (a == b && b == c){
    printf("Equilateral");
    
    }
    else if (a == b || b == c || a == c){
        printf("Isosceles");
    }
        else {
        printf("Scalene");
        }
        return 0;
        }