#include<stdio.h>
int main()
{
    int a;
    int b;
    int c;
    scanf("%d", &a);
    scanf("%d", &b);
    scanf("%d", &c);
    if(a==b&&b==c&&c==a)
    {
        printf("Equilateral");
    
    }
    else if(a==b|| b==c|| c==a)
    {
        printf("Isosceles");
    }
    else ("Scalene")
    {
     printf("They are invalid input.\n");
    } else {
        printf("They are valid input. \n");
    }
    return 0;
    
}
























{
    int age = 20;

    if (age >= 18) {
       

    return 0;
}