#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)<=c||(a+c)<=b||(b+c<+a)){
        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;
}