#include <stdio.h>
int main(void) {
    int a, b, c;
    if (scanf("%d %d %d", &a, &b, &c) != 3) {
        printf("Invalid input");
        return 0;
    }
    if (a <= 0 ||b <= 0 || c <= 0) {
        printf("Invalid input");
        return 0;
    }
    if (a == b || b == c) {
        printf("Equilateral");
    }
    else if (a == b || b == c || a == c) {
        printf("Isosceles");
    }
    else {
        printf("Scalene";
    }
    return 0;
}