[R] Lowest number in a numeric string

[mogwai84]

Hi all,

I've got a very long numeric string. I want to find the lowest number that
isn't in that string.

E.G

String = 123456
Therefore 7 is the lowest number not in that string

E.G.2

String = 1234567891011
Therefore 13 is the lowest number not in that string.

Any thoughts? p.s. I'm an R noob.

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