#include<stdio.h>
int main(){
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    if(a <=0 || b <= 0 || c <= 0){
        printf("Invalide Input\n");
        return 0;
}
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;
}