rt

#include<iostream>
#include<cstdio>
using namespace std;
int a,b,c,d,e,n,flag;
int rem[1000][6],p;
char op[10];
int main()
{
//	freopen("network.in","r",stdin);
//	freopen("network.out","w",stdout);
	cin >> n;
	for(int i = 1; i <= n; i++)
	{
		cin >> op;
		a = b = c = d = e = -1;
		scanf("%d.%d.%d.%d:%d",&a,&b,&c,&d,&e);
		if(a < 0 || b < 0 || c < 0 || d < 0 || e < 0)
		{
			cout << "ERR" << endl;
			continue;
		}
		if(a > 255 || b > 255 || c > 255 || d > 255 || e > 65535)
		{
			cout << "ERR" << endl;
			continue;
		}
		if(op[0] == 'S')
		{
			flag = 0;
			for(int j = 1; j <= p; j++) if(a == rem[j][1] && b == rem[j][2]
			 && c == rem[j][3] && d == rem[j][4] && e == rem[j][5])
			{
				flag = 1;
				break;
			}
			if(flag == 0)
			{
				p++;
				rem[p][1] = a;
				rem[p][2] = b;
				rem[p][3] = c;
				rem[p][4] = d;
				rem[p][5] = e;
				rem[p][0] = i;
				cout << "OK" << endl; 
			}
			else cout << "FAIL" << endl;
		}
		else
		{
			flag = 0;
			for(int j = 1; j <= p; j++) if(a == rem[j][1] && b == rem[j][2]
			 && c == rem[j][3] && d == rem[j][4] && e == rem[j][5])
			{
				flag = rem[j][0];
				break;
			}
			if(flag != 0) cout << flag << endl;
			else cout << "FAIL" << endl;
		}
	}
	return 0;
}