Telephone Keypad Letter Mapping

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Problem

http://en.wikipedia.org/wiki/Telephone_keypad

On telephone keypads the numbers also refer to letters,

0 = none (in some telephones, "OPERATOR" or "OPER")
1 = none (in some older telephones, QZ)
2 = ABC
3 = DEF
4 = GHI
5 = JKL
6 = MNO
7 = P(Q)RS
8 = TUV
9 = WXY(Z)

Write an interpreter that takes a string of numbers and produces a string of the expected text using 1 as a delimiter and 0 as a space, for example 21 would = a, 221 = b, 6661 = o 99991 = z 21221222101441331555155516661 = abc hello

Options

exec is denied

now post-mortem time, all source codes will be revealed

Sample input:_

21221222101441331555155516661

Sample output:

abc hello

Sample input:_

2122122213133133314144144415155155516166166617177177717777161661666191991999199991

Sample output:

abcdefghijklmnopqrstuvwxyz

Sample input:_

44133155515551666101416661555133313317771777710144410144166617133101999166618810133166151666199910181441444177771016661661331

Sample output:

hello golfers i hope you enjoy this one

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