Telephone Keypad Letter Mapping by 51b

n,m,k,l=7;main(c){for(;c=~getchar()%16;m=c,k++)n=c+2?n+1:!putchar(!~m?l=0,32:n+87-m*28/9+k%68/59*l);}

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

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