PROGRAMMING:Counts the number of occurrences of each letter in the string

Input a line of string to count the number of 26 English letters, case insensitive, other characters ignored（ Note: there is a space after each output, that is, there is a space after the last Z
Tips:
The ord() function is used to convert characters to integers, such as ord ('a ') = 97
###Input format:
Enter a string of arbitrary characters
###Output format:
Output the number of times each letter appears in the sample format
###Input sample 1:
Here is a set of inputs. For example:
```in
aabbccdeefghzqw
```
###Output sample 1:
The corresponding output is given here. For example:
```out
Number of times each letter appears:
2 a 2 b 2 c 1 d 2 e 1 f 1 g 1 h 0 i 0 j
0 k 0 l 0 m 0 n 0 o 0 p 1 q 0 r 0 s 0 t
0 u 0 v 1 w 0 x 0 y 1 z
```
###Input sample 2:
Here is a set of inputs. For example:
```in
hkhhabHJKfqUukAAABBBZZZz
```
###Output sample 2:
The corresponding output is given here. For example:
```out
Number of times each letter appears:
4 a 4 b 0 c 0 d 0 e 1 f 0 g 4 h 0 i 1 j
3 k 0 l 0 m 0 n 0 o 0 p 1 q 0 r 0 s 0 t
2 u 0 v 0 w 0 x 0 y 4 z
```
###Input sample 3:
Here is a set of inputs. For example:
```in
428;.,; 1@##@#
```
###Output sample 3:
The corresponding output is given here. For example:
```out
Number of times each letter appears:
0 a 0 b 0 c 0 d 0 e 0 f 0 g 0 h 0 i 0 j
0 k 0 l 0 m 0 n 0 o 0 p 0 q 0 r 0 s 0 t
0 u 0 v 0 w 0 x 0 y 0 z
```







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