#include<stdio.h>
int main(){
    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    if (a<0 && b<0 &7 c<0)
        printf("Invalid Input");
    elif (a==b==c)
        printf("Equilateral");
    elif (a==b || b==c || c==a)
        printf("Isosceles");
    else
        printf("Scalene");
    return 0;
}