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