Write a program that receives user input a string (may contain spaces), all of which appeared in the statistics of all characters, and in accordance with the order of frequency output. Input frequency by the same sequence of characters output.

8-4\4.c
...\4.dsp
...\4.dsw
...\4.ncb
...\4.opt
...\4.plg
...\42.c
...\42.dsp
...\42.dsw
...\42.ncb
...\42.opt
...\42.plg
...\Debug\4.exe
...\.....\4.ilk
...\.....\4.obj
...\.....\4.pch
...\.....\4.pdb
...\.....\42.exe
...\.....\42.ilk
...\.....\42.obj
...\.....\42.pch
...\.....\42.pdb
...\.....\frequence.exe
...\.....\frequence.ilk
...\.....\frequence.obj
...\.....\frequence.pch
...\.....\frequence.pdb
...\.....\vc60.idb
...\.....\vc60.pdb
...\frequence.c
...\frequence.dsp
...\frequence.dsw
...\frequence.ncb
...\frequence.opt
...\frequence.plg
...\新建文本文档.txt
...\Debug
8-4

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