//By SiriusRen

#include <map>

#include <string>

#include <cstdio>

#include <cstring>

#include <iostream>

using namespace std;

const int N=;

int n,m,v[N],next[N],tot,first[N],stk[N],top,jy,p[N],cnt,T,Cnt,dfn[N],low[N],vis[N];

string s1,s2;

map<string,int>mp;

void add(int x,int y){v[tot]=y,next[tot]=first[x],first[x]=tot++;}

void tarjan(int x){

    dfn[x]=low[x]=++Cnt,stk[++top]=x,vis[x]=;

    for(int i=first[x];~i;i=next[i]){

        if(!dfn[v[i]])tarjan(v[i]),low[x]=min(low[x],low[v[i]]);

        else if(vis[v[i]])low[x]=min(low[x],dfn[v[i]]);

    }

    if(low[x]==dfn[x]){

        T++;

        do{

            jy=stk[top--],vis[jy]=,p[jy]=T;

        }while(jy!=x);

    }

}

int main(){

    memset(first,-,sizeof(first));

    scanf("%d",&n);

    for(int i=;i<=n;i++){

        cin>>s1>>s2;

        mp[s1]=++cnt,mp[s2]=++cnt;

        add(cnt,cnt-);

    }

    scanf("%d",&m);

    for(int i=;i<=m;i++){

        cin>>s1>>s2;

        add(mp[s1],mp[s2]);

    }

    for(int i=;i<=cnt;i++)if(!dfn[i])tarjan(i);

    for(int i=;i<=n;i++){

        puts(p[i*]!=p[i*-]?"Safe":"Unsafe");

    }

}