Problem

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字母频率

Problem

任意字母数字字符作为程序的输入。这些字符的输入以点结尾。需要编写一个程序来打印一系列小写英文字母 ('a' 'b'... 'z') 从输入序列和它们的重复频率。打印必须按字母顺序进行。
例如，让输入以下字符： fhb5kbfыshfm.
在这种情况下，程序应该输出：
b2
f3
h2
k1
m1
s1

time 1000 ms
memory 32 Mb
Rules for program design and list of errors in automatic problem checking

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