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