codeforces 1825A

int main()
{
    ll t;
    cin>>t;
    // cin.ignore(numeric_limits<streamsize>::max(), '\n');
    while(t--){
    	string s;
    	cin>>s;
    	if(s.length()==1){
    		cout<<-1<<endl;
    	}
    	else{
    		set<char> x;
    		for(auto i:s){
    			x.insert(i);
    		}
    		if(x.size()==1){
    			cout<<-1<<endl;
    		}
    		else{
    			cout<<s.length()-1<<endl;
    		}
    	}
    }

    

    return 0;
}