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#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main()
{

    vector <char> a;
    for (int i = 0; i < n; i += 1) {
        cin >> a[i];

        if (a[i] == 'A' || a[i] == 'O' || a[i] == 'Y' || a[i] == 'E' || a[i] == 'U' || a[i] == 'I') {
            a[i] = ' ';
        }
        if (a[i] >= 65 || a[i] <= 65 + 26) {
            a[i] -= 32;
        }
    }
    for (int i = 0; i < size(a); i++) {
        cout << "." << a[i];
    }

    return 0;
}
//32