#include<stdio.h>
int main() {


    int a ,b,c;
    scanf("%d",&a);
    scanf("%d",&b);
    scanf("%d",&c);
    if (a < 0 || b < 0|| c < 0) {
        printf("Invalid input");
    }
    else if  (a == b and b == c) {
        printf("Equilateral");
    }
    else if (a == b or a == c) {
        printf("Isosceles");
    }
    else if (a != b or b != c or a != c){
        printf("Scalene");
    }
    else{
        printf("Invalid input");
    }
    
}