PROGRAMMING:hello,world

###Task description:
```
Write a program to output a line of text: Hello, world.
Note: "Hello, world" program refers to the computer program that outputs the string of "Hello, world" on the computer screen. This routine is widely used in the C program language by Brian Kernighan and Dennis M. Ritchie.
```
###Input format:
This program does not require input
###Output format:
Output a line of text: Hello, world
###Input example:
```in
```
###Output example:
```out
hello,world
```







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