Telephone Keypad Letter Mapping Fixed by Lost_dog

main=interact('+'#)
c#(x:y)|c=='+'="  adgjmptw"!!read[x]#y|x>'1'=succ c#y|1>0=c:'+'#y
c#z=z

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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