void classify_tri(int a,int b,int c){
if (a <= 0 || b<=0 || c<=0){
   printf ("Invalid Input")
   return ;
}
if(a == b && b == c){
printf ("Equilateral")}
else if(a==b || b==c || a==c){
    printf("Isosceles");
}else{
    printf("Scalene\n");
  }
}
int main(){
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    classify_tri(a,b,c);
    return 0;
}