#include<stdio.h>
int main(){
    int n1,n2,n3;
    scanf("%d%d%d",&n1,&n2,&n3);
  if(n1<0||n2<0||n3<0){
      printf("Invalid Input");
  }  
  else if(n1=n2&&n2=n3&&n3=n1){
      printf("Equilateral");
  }
  else if(n2=n1&&n2!=n3||n3=n2&&n2!=n1){
      printf("Isosceles");
  }
  else if(n1!=n2&&n2!=n3&&n3!=n1){
      printf("Scalene");
  }
}