题目链接：http://www.codeforces.com/problemset/problem/118/A

题意：字符串转换……

C++代码：

#include 
      
       #include 
       
        using namespace std;string s;bool _in(char c, string s){    for (int i =0 ; i < s.length(); i ++)        if (c == s[i])            return true;    return false;}int main(){    cin >> s;    int len = s.length();    for (int i = 0; i < len; i ++)    {        char c = s[i];        if (c >= 'A' && c <= 'Z')            c += 32;        if (_in(c, "aeiouy"))            ;        else            cout << "." << c;    }    return 0;}