/*#include<stdio.h>
int main()
{
int a, b;
int i;
scanf("%d %d", &a, b);
for(i=1;i<=b ; i++){
if(a%i==0||b%i==0)
{
printf("%d ", i);
}
}
}*/
/*#include<stdio.h>
int main()
{
int a, b;
int i, j;
int n[1000]= {};
int max=0;
scanf("%d %d", &a, &b);
for(i=1; i<=b; i++)
{
if(a%i==0&&b%i==0)
{
if(i>max)
{
max = i;
}
}
}
printf("%d", max);
}*/
/*
test case1: 10 20 15 25: cross O
test case2: 50 60 40 70: not cross X
test case3: 20 10 15 25: cross X
*/
#include<stdio.h>
int main()
{
int a, b, c, d;
scanf("%d %d %d %d", &a, &b, &c, &d);
if(a>b&&c<d&&a<d)
{
printf("not cross");
}
else if(a<b&&c>d&&b<d)
{
printf("not cross");
}
else
{
printf("cross");
}
}