Codeforces 118A - String Task

题目： A. String Task

time limit per test: 2 seconds
memory limit per test: 256 megabytes
input: standard input
output: standard output

Petya started to attend programming lessons. On the first lesson his task was to write a simple program. The program was supposed to do the following: in the given string, consisting if uppercase and lowercase Latin letters, it:

deletes all the vowels,
inserts a character “.” before each consonant,
replaces all uppercase consonants with corresponding lowercase ones.

Vowels are letters “A”, “O”, “Y”, “E”, “U”, “I”, and the rest are consonants. The program’s input is exactly one string, it should return the output as a single string, resulting after the program’s processing the initial string.

Help Petya cope with this easy task.

Input

The first line represents input string of Petya’s program. This string only consists of uppercase and lowercase Latin letters and its length is from 1 to 100, inclusive.

Output

Print the resulting string. It is guaranteed that this string is not empty.

Examples

Input

tour

Output

.t.r

Input

Codeforces

Output

.c.d.f.r.c.s

Input

aBAcAba

Output

.b.c.b

思路：

1.遍历给定的字符串，是元音字母就删除，同时i–；
2.是辅音字母就将它转换成小写，在i位置插入’.’，同时i++;

代码：

#include<iostream>
#include<string>
using namespace std;
bool isVowel(char c){
	if(c=='a'||c=='o'||c=='y'||c=='e'||c=='u'||c=='i') return true;
	if(c=='A'||c=='O'||c=='Y'||c=='E'||c=='U'||c=='I') return true;
	return false;
}
int main(){
	string s;
	cin>>s;
	for(int i=0;i<s.length();i++){
		if(isVowel(s[i])) s.erase(i--,1);
		else{
			s[i]=tolower(s[i]);
			s.insert(i++,".");
		}
	}
	printf("%s",s.c_str());
	return 0;
}