#include<bits/stdc++.h>
using namespace std;
const int N=1e3+10;
long long a[N],b[N],c[N],d[N],e[N],n,xx,m[N],cnt=0,jame;
char f[N],g[N],h[N],l[N],ff,gg,hh,ll; 
bool p;
string op,s,t,t1,t2,t3,t4,t5;
bool one(long long x){
	int xxx=x;
	x=m[x];
	if(x==0){
		return 0;
	}
	if(a[x]==a[xx] && f[x]==f[xx] && b[x]==b[xx] && g[x]==g[xx] && c[x]==c[xx] && h[x]==h[xx] && d[x]==d[xx] && l[x]==l[xx] && e[x]==e[xx]){
		return 1;
	}
	x=xxx;
	return one(x-1);
}
bool two(long long x){
	if(a[x]<0 || a[x]>255){
		return 1;
	}
	if(b[x]<0 || b[x]>255){
		return 1;
	}
	if(c[x]<0 || c[x]>255){
		return 1;
	}
	if(d[x]<0 || d[x]>255){
		return 1;
	}
	if(e[x]<0 || e[x]>65535){
		return 1;
	}
	if(f[x]!='.'){

		return 1;
	}
	if(g[x]!='.'){
		return 1;
	}
	if(h[x]!='.'){
		return 1;
	}
	if(l[x]!=':'){
		return 1;
	}
	return 0;
}
long long three(long long x,long long y){
	int yy=y;
	y=m[y];
	if(y==0){
		return 0;
	}
	if(a[x]==a[y] && f[x]==f[y] && b[x]==b[y] && g[x]==g[y] && c[x]==c[y] && h[x]==h[y] && d[x]==d[y] && l[x]==l[y] && e[x]==e[y]){
		return y;
	}
	y=yy;
	return three(x,y+1);
}
int main(){ 
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>op;
		cin>>s;
		jame=0;
		t="";
		p=0;
		for(int j=0;j<=s.size();j++){
			if(s[j]>='0' && s[j]<='9'){
				t=t+s[j];
			}
			else{  
				if(t[0]=='0' && t.size()!=1){
					cout<<"ERR"<<endl;
					p=1;
					break;
				}
				if(t.size()>0){
					jame++;
				}
				if(jame==1){
					t1=t;
					ff=s[j];
				}
				if(jame==2){
					t2=t;
					gg=s[j];
				}
				if(jame==3){
					t3=t;
					hh=s[j];
				}
				if(jame==4){
					t4=t;
					ll=s[j];
				}
				if(jame==5){
					t5=t;
				}
				t="";
			}
		}
		if(p==1){
			continue;
		}
		if(jame!=5){
			cout<<"ERR"<<endl;
			continue; 
		}
		for(int j=0;j<t1.size();j++){
			a[i]=a[i]*10+(t1[j]-'0');
		}
		for(int j=0;j<t2.size();j++){
			b[i]=b[i]*10+(t2[j]-'0');
		}
		for(int j=0;j<t3.size();j++){
			c[i]=c[i]*10+(t3[j]-'0');
		}
		for(int j=0;j<t4.size();j++){
			d[i]=d[i]*10+(t4[j]-'0');
		}
		for(int j=0;j<t5.size();j++){
			e[i]=e[i]*10+(t5[j]-'0');
		}		
		f[i]=ff;
		g[i]=gg;
		h[i]=hh;
		l[i]=ll;		
		xx=i;
		if(op[0]=='S'){
			m[++cnt]=i;
			if(two(i)){
				cout<<"ERR"<<endl;
			}
			else if(one(cnt-1)){
				cout<<"FAIL"<<endl;
			}
			else{
				cout<<"OK"<<endl;
			}
		}
		else{
			if(two(i)){
				cout<<"ERR"<<endl;
			}
			else{
				if(three(i,1)==0){
					cout<<"FAIL"<<endl;
				}
				else{
					cout<<three(i,1)<<endl;
				}
			}
		}
	}
}

求求了，我错在哪里了