// editor1
#include<stdio.h>
int main()
{
    int a,b,c;
    scanf("%d %d %d", &a,&b,&c);
    
    if(a<0 || b<0 || c<0)
        printf("Invalid Input");
    if((a==b)&&(b==c))
        printf("Equilateral");
    else if((a==b)||(b==c)||(a==c)
        printf("Isosceles");
    else if((a!=b)&&(b!=c)&&(a!=c))
        printf("Scalene");
    return 0;
}