cy, 145 bytes

Result

WA

Code [DL]

100 =a :>s =b [0,0,0,0,0,0,0,0,0,0,] =c {$a} {.a -- $c $b $a :: :i &:: 1 + ::= } while {.a &++ 10 <} { $c $a :: =d {.d &--} {$a :<<} while} while

stdin

1622247633148180882563173133880365967946899417081702381064031053584258012635905870050183011337803728

stdout

11111111111112222222233333333333333344444455555555666666667777777788888888888888899999

stderr

RubyError
	@ `&--' (0:3)
RubyError
	@ `while' (0:30)
RubyError
	@ `while' (0:140)
/home/esolang/interpreters/cy.rb:285:in `block in <class:Cy>': undefined method `-' for nil:NilClass (NoMethodError)
	from /home/esolang/interpreters/cy.rb:96:in `instance_exec'
	from /home/esolang/interpreters/cy.rb:96:in `block (2 levels) in initialize'
	from /home/esolang/interpreters/cy.rb:549:in `block in runMeth'
	from /home/esolang/interpreters/cy.rb:665:in `block in exec'
	from /home/esolang/interpreters/cy.rb:660:in `each'
	from /home/esolang/interpreters/cy.rb:660:in `exec'
	from /home/esolang/interpreters/cy.rb:583:in `block in block'
	from /home/esolang/interpreters/cy.rb:450:in `instance_exec'
	from /home/esolang/interpreters/cy.rb:450:in `call'
	from /home/esolang/interpreters/cy.rb:330:in `block in <class:Cy>'
	from /home/esolang/interpreters/cy.rb:80:in `instance_exec'
	from /home/esolang/interpreters/cy.rb:80:in `block (2 levels) in initialize'
	from /home/esolang/interpreters/cy.rb:549:in `block in runMeth'
	from /home/esolang/interpreters/cy.rb:665:in `block in exec'
	from /home/esolang/interpreters/cy.rb:660:in `each'
	from /home/esolang/interpreters/cy.rb:660:in `exec'
	from /home/esolang/interpreters/cy.rb:583:in `block in block'
	from /home/esolang/interpreters/cy.rb:331:in `block in <class:Cy>'
	from /home/esolang/interpreters/cy.rb:80:in `instance_exec'
	from /home/esolang/interpreters/cy.rb:80:in `block (2 levels) in initialize'
	from /home/esolang/interpreters/cy.rb:549:in `block in runMeth'
	from /home/esolang/interpreters/cy.rb:665:in `block in exec'
	from /home/esolang/interpreters/cy.rb:660:in `each'
	from /home/esolang/interpreters/cy.rb:660:in `exec'
	from /home/esolang/interpreters/cy.rb:777:in `block (3 levels) in <main>'
	from /home/esolang/interpreters/cy.rb:844:in `<main>'

strace