#include<stdio.h>
int  main(){
    int a,b,c;
    scanf("&d &d &d",&a, &b, &c);
    if(a<=0 || b<=0 || c<=0|| a>=100 || b>=100 || c>=100){
        printf("Invalid Input");
    }
    else if(a==b && b==c)
    {
        printf("Equilateral\n");
    }
    else if(a==b ||  b==c || c==a)
    {
        printf("Isosceles\n");
    }
    else{
        printf("Scalene\n");
    }
    return 0;
}