#include<stdio.h>
int main() {
    int n1, n2, n3;
    scanf("%d %d %d", &n1, &n2, &n3);
    if n1 < 0 || n2 < 0 || n3 < 0 {
        printf("Invalid input");
    }
    else if (n1 == n2 == n3) {
        printf("Equilateral") ;
    }
    else if (n1 == n2 || n1 == n3 || n2 == n3) {
        printf("Isosceles");
    }
    else {
        printf("Scalene");
    } 
    return 0;
}