#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;
    }