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