#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");
    return 0;
    }
    if (a == b && b == c) {
        print("Equilateral");
    }
    else if (a == b || b == c || a == c) {
        printf("Isosceles");
    }
    else {
        printf("Scalene");
    }
    return 0;
}