#include<iostream>
#include<math.h>
using namespace std;

struct punct
{
       float x,y;
}A,B,C;
    
float dist(punct A, punct B)
{
      return sqrt((A.x-B.x)*(A.x-B.x)+(A.y-B.y)*(A.y-B.y)); 
}

void citire(punct &A)
{
 cin>>A.x>>A.y;
}

int main()
{
    citire(A);
    citire(B);
    citire(C);
    float a,b,c;
    a=dist(B,C);
    b=dist(A,C);
    c=dist(A,B);
    if(a==b+c || c==a+b || b==c+a)
      cout<<"coliniare";
    else cout<<"nu";  
}