#include<bits/stdc++.h>
using namespace std;
long long a=-1,b=-1,c=-1,d=-1,e=-1;
int n;
char op[100],ad[100],yee[100];
map<string,int> yeewu;
bool flag=0;
void check(char x[])
{
	flag=0;
	sscanf(x,"%lld.%lld.%lld.%lld:%lld",&a,&b,&c,&d,&e);
	sprintf(yee,"%lld.%lld.%lld.%lld:%lld",a,b,c,d,e);
	for(int i=0;i<strlen(x);i++)
	{
		if(x[i]!=yee[i])
		{
			flag=1;
			return;
		}
	}
	if(a<0||a>255||b<0||b>255||c<0||c>255||d<0||d>255||e<0||e>65535) 
	{
		flag=1;
		return;
	}	

	
	return;
}
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>op>>ad;
		string t(ad);
		check(ad);
		if(op[0]=='S')
		{
			if(flag==1)
			{
				cout<<"ERR"<<endl;
				continue;
			}
			if(yeewu.count(t)==1)
			{
				cout<<"FAIL"<<endl;
				continue;
			}
			if(yeewu.count(t)==0)
			{
				cout<<"OK"<<endl;
				yeewu[t]=i;
				continue;
			}
		}
		if(op[0]=='C')
		{
			if(flag==1)
			{
				cout<<"ERR"<<endl;
				continue;
			}
			if(yeewu.count(t)==1)
			{
				cout<<yeewu[ad]<<endl;
				continue;
			}
			if(yeewu.count(t)==0)
			{
				cout<<"FAIL"<<endl;
				continue;
			}
		}
	}
	
	
	
	return 0;
}