#include<bits/stdc++.h>
using namespace std;
 
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int t;
	cin>>t;
	while(t--){
		string s;
		cin>>s;
		int n=s.length();
		int ar[n],cou;
		for(int i=0;i<n;i++){
			if(s[i]=='.') ar[i]=0;
			else{
				ar[i]=s[i]+'0';
				ar[i]-=96;
				++cou;
			}
		}
		if(cou==0 || cou==1){
			cout<<"safe"<<endl;
			continue;
		}
		int f=0,*br=ar;
		for(int i=0;i<n;i++){
			int j=ar[i];
			br[i]=0;
			if(j==0){
				continue;
			}
			for(int k=i-j;k<=i+j;k++){
				if(k<0){
					continue;
				}
				if(br[k]!=0){
					f=1;
					break;
				}
			}
			br[i]=j;
			if(f==1){
				break;
			}
		}
		cout<<"unsafe"<<endl;
	}
	return 0;
}

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5
....
.2.....
.2...2..
.1.1.1.
...3..2..