#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) {
        printf("Eqilateral");
    }
    else if(a == b || b == c \\ a == c) {
        printf("Isosceles");
    }
    else {
        printf("scalene");
    }
    return 0;
}