Problem1685--CF797 - C. Minimal string

1685: CF797 - C. Minimal string

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Time Limit : 2.000 sec  Memory Limit : 256 MiB

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Description

time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Petya recieved a gift of a string s with length up to 105 characters for his birthday. He took two more empty strings t and u and decided to play a game. This game has two possible moves:
  • Extract the first character of s and append t with this character.
  • Extract the last character of t and append u with this character.
Petya wants to get strings s and t empty and string u lexicographically minimal.
You should write a program that will help Petya win the game.
Input
First line contains non-empty string s (1≤|s|≤105), consisting of lowercase English letters.
Output
Print resulting string u.
Examples
Input
cab
Output
abc
Input
acdb
Output
abdc

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