#include<stdio.h>
void classifyTriangle(int a,int b,int c){
    if(a<=0||b<=0||c<=0){
        printf("Invalid Input\n");
    }
if(a+b<=c||a+c<=b||b+c<=a){
            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");
    }
}
  int main(){
      long long a,b,c;
      if(scanf("ll%dll%dll%d",&a,&b,&c)!=3){
          printf("Invalid Input");
          return 0;
      }
      classifyTriangle(a,b,c);
      return 0;
  }