PROGRAMMING:Statistical length of service
Given the length of service of $$n $$employees in a company, it is required to output the number of employees in each length of service segment in increasing order.
###Input format:
First, enter the positive integer $$n $$($$Le 10 ^ 5 $$), that is, the total number of employees; Then, $$n $$integers are given, that is, the length of service of each employee, in the range of [0,50].
###Output format:
Output the number of employees of each working age according to the increasing order of working age. The format is: "working age: number of employees". One line for each item. If the number of people is 0, the item is not output.
###Input example:
```in
eight
10 2 0 5 7 2 5 2
```
###Output example:
```out
0:1
2:3
5:2
7:1
10:1
```
answer：If there is no answer, please comment
###Input format:
First, enter the positive integer $$n $$($$Le 10 ^ 5 $$), that is, the total number of employees; Then, $$n $$integers are given, that is, the length of service of each employee, in the range of [0,50].
###Output format:
Output the number of employees of each working age according to the increasing order of working age. The format is: "working age: number of employees". One line for each item. If the number of people is 0, the item is not output.
###Input example:
```in
eight
10 2 0 5 7 2 5 2
```
###Output example:
```out
0:1
2:3
5:2
7:1
10:1
```
answer：If there is no answer, please comment