#include<stdio.h>
int main(){
    scanf("%d %d %d", &a, &b, &c);
    if(a<=0 || b<=0 || c<=0||(a+b<=c) || (a+c<=b)||(b+c<=a)){
        printf("Invalid input");
    }
    else if(a==b && b==c){
        printf("Equilateral\n");
    }
    else if(a==b || b==c || a==c){
        printf("Isosceles\n");
    }
    else {
        printf("Scalene\n");
    }
    return 0;
}