#include<stdio.h>
int main ()
{
    int n1,n2n3;
    scanf("%d",& n1);
    scanf("%d",& n2);
    scanf("%d",& n3);
    if(n1<0 || n2<0 || n3<0 || n1>=100 || n2>=100 || n3>=100)
    printf("Invalid Input");
    else if(n1==n2 && n2==n3)
    printf("Equilateral");
    else if(n1==n2 || n2==n3 || n3==n1)
    printf("Isosceles");
    else
    printf("Scalene");
    return 0;
}