#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\n");
}
else if(a==b && b==c){
    printf("Equilateral\n");
}
else if (a==b || b==c || a==c) {
    printf("Isosceles\n");
}
else {
    printf("Scalene\n");

return 0;
}