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
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