#include<stdio.h>
int main()
{
    int n1,n2,n3;
    float a,b,c;
    scanf("%d %d %d",&n1,&n2,&n3);
    if(n1=n2=n3):
    printf("Equilateral");
    elif(n1=n2!=n3 or n1!=n2=n3 or n1=n3!=n2):
    printf("Isosceles");
    elif(n1!=n2!=n3):
    printf("Scalene");
    else:
    printf("Invalid Input");
    return 0;
}