文件名称:A-Zpinlv
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从键盘输入一行文本，统计其中每个英文字母出现的频率，并输出出现过的英文字母及其次数，未出现过的不需要显示。为了简化问题的复杂度，假设在统计过程中不区分字母的大小写，即 A 与 a 被认为是一种字母。
Input
先从键盘输入一行文本。以换行符结束。
Output
输出统计结果。
Sample Input:
Studing C Language
Sample Output:-Enter a line of text from the keyboard, statistical frequency of occurrence of each of the letters of the alphabet, and output over the letters of the alphabet and the number has not been seen not to be displayed. In order to simplify the complexity of the problem, it is assumed in the statistical process does not distinguish between upper and lower case letters, A and a is considered to be a letter.
Input
Start with the keyboard input line of text. With a newline character.
Output
Output statistics.
Sample Input:
Studing C Language
Sample Output:
Input
先从键盘输入一行文本。以换行符结束。
Output
输出统计结果。
Sample Input:
Studing C Language
Sample Output:-Enter a line of text from the keyboard, statistical frequency of occurrence of each of the letters of the alphabet, and output over the letters of the alphabet and the number has not been seen not to be displayed. In order to simplify the complexity of the problem, it is assumed in the statistical process does not distinguish between upper and lower case letters, A and a is considered to be a letter.
Input
Start with the keyboard input line of text. With a newline character.
Output
Output statistics.
Sample Input:
Studing C Language
Sample Output:
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A-Zpinlv.c