#include <cstdio>
#include <iostream>
#include <cstring>
using namespace std;
int main() {
char s[105];
scanf("%s", s);
for(int i=0; i<strlen(s); i++) {
if(s[i]!='A' && s[i]!='O' && s[i]!='Y' && s[i]!='E' && s[i]!='U' && s[i]!='I' && s[i]!='a' && s[i]!='o' && s[i]!='y' && s[i]!='e' && s[i]!='u' && s[i]!='i') {
if(s[i]<91) printf(".%c", s[i]+32);
else printf(".%c", s[i]);
}
}
return 0;}
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