文件名称:order
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输入一串字符，以“？”结束。统计各字母出现的次数，并按字母出现的多少输出
（先输出次数多的，次数相同的按字母表顺序输出，不出现的字母不输出）-Enter the string of characters to "?" End. Statistics of the number of letters appeared, and the number of letters appears output (first output frequency and number of the same alphabetical order of output, does not appear the letters do not output)
（先输出次数多的，次数相同的按字母表顺序输出，不出现的字母不输出）-Enter the string of characters to "?" End. Statistics of the number of letters appeared, and the number of letters appears output (first output frequency and number of the same alphabetical order of output, does not appear the letters do not output)
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order.cpp