#include <stdio.h>
int main(){
a, b, c = map(int, input().split())
if a < 0 or b < 0 or c < 0:
    print("Invalid Input")
    else:
    if a== b == c:
    print("Equilaterial")
    elif a == b == c or a == c:
    print("Isosceles")
    else;
    print("Scalene")
    return 0;
}