#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\n");
    }
    else if(a + b <= c  || (a + c <= b) || (b + c <= a))
    {
        printf("Invalid input\n")
    }
    else if( a == b && b == c)
    {
        printf("Equilateral\n");
    }
    else if ( a == b || b == c || a == c)
    {
        printf("Isosceles\n");
    }
    else
    {
        printf("Scalene\n");
    }
    return 0;
}