#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;
        }