#include <stdio.h>

int main(){
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    
    if (a<0||b<0||c<0){
        print("Invalid Input");
    }
    else{
        if(a==b&&b==c){
            print("Equilateral")
        }
        else if (a == b || b == c || a == c)
           print("Isosceles");
        }
        else{
            print("Scalene");
        }
    }
)