Implement a function pattern, which returns the following pattern for up to n number of rows. If n < 1 then it should return " " i.e. empty string. There are no whitespaces in the pattern.

Pattern:
1
22
333
....
.....
nnnnnn

Examples

pattern(5):
1
22
333
4444
55555

pattern(11):
1
22
333
4444
55555
666666
7777777
88888888
999999999
10101010101010101010
1111111111111111111111

Tests

pattern(4)
pattern(8)
pattern(0.5)

Good luck!

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