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  1. @Mathematica
  2.  
  3. chooseNotChar[char_]:={{"A","Z"},{"a","z"},{"0","9"}}//
  4. Map[Apply[CharacterRange,#]&,#]&//
  5. Apply[Join,#]&//
  6. Select[#,#!=char&]&//
  7. RandomChoice;
  8.  
  9. In[1] := chooseNotChar["c"]
  10. Out[1] = "v"
  11.  
Not running #stdin #stdout 0s 0KB
stdin
Standard input is empty
stdout
Standard output is empty