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