118A String Task

#include <cmath>#include <cstdio>#include <cstdlib>#include <cstring>#include <iostream>#include <string>#include <algorithm>using namespace std;int main() {    string str;    string ans = "";    cin >> str;    int len = str.length();    for(int i = 0; i < len; ++i) {        if(str[i] == 'A' || str[i] == 'O' || str[i] == 'Y' || \           str[i] == 'E' || str[i] == 'U' || str[i] == 'I' || \           str[i] == 'a' || str[i] == 'o' || str[i] == 'y' || \           str[i] == 'e' || str[i] == 'u' || str[i] == 'i') continue;        ans += '.';        if(str[i] >= 'A' && str[i] <= 'Z') {            ans += str[i] - 'A' + 'a';        } else {            ans += str[i];        }    }    cout << ans << endl;    return 0;}