##Task:
You have to write a function **pattern** which creates the following pattern upto n number of rows. *If the Argument is 0 or a Negative Integer then it should return "" i.e. empty string.*
##Examples:
pattern(4):
    1234
    234
    34
    4
pattern(6):
    123456
    23456
    3456
    456
    56
    6
```Note: There are no blank spaces```
```Hint: Use \n in string to jump to next line```
def pattern(n):
    return '\n'.join( ''.join(str(j) for j in range(i,n+1)) for i in range(1,n+1) )
def pattern(n):
    return '\n'.join( ''.join(str(j) for j in range(i,n+1)) for i in range(1,n+1) )