#STL
string
https://www.acwing.com/problem/content/4218/
#include<bits/stdc++.h
using namespace std;
int main()
{
string s,cs;
cs = "aeiouy";
cin >> s;
for(auto c : s)
{
c = tolower(c); //大写变为小写!
if(cs.find(c) == -1) //找到返回第一次出现的下标,否则返回-1;
{
cout<<"."<<c;
}
}
cout<<endl;
return 0;
}