reduce single number

  1. A

    Subtract 1 from a character in a number

    Good day, all I need a formula that will allow me to subtract, and sometimes add, the 13th character by 1. So this number here: 22222-222-A22ZQ I need to change to: 22222-222-A21ZQ And sometimes (if it matters), I'll need to change this number: 22222-222-A22 To this number: 22222-222-A21...

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