#include<bits/stdc++.h> using namespace std; long long n,m,mink=25; char ch; string s,minn="zzzzzzzzzzzzzzzz"; int main() { cin>>n>>m; for(int i=1;i<=n;i++) { s=""; for(int j=1;j<=m;j++) { cin>>ch; if(ch=='#') { if(s!=""&&(s.size()==mink&&s<minn||s.size()<mink)) { mink=s.size(); minn=s; } s="";//空字符串 } else s+=ch; }//一次判断字符串 if(s!=""&&(s.size()==mink&&s<minn||s.size()<mink)) { mink=s.size(); minn=s; }//二次判断字符串 } cout<<minn; return 0; }