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