Now posted: Digits from words

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Convert a number in words to digits.

Input

• A number in words from one to ninety-nine.

Output

• The corresponding number in digits from 1 to 99.
• This may be a string of digits or a number of that value (such as a float or an integer).

Test cases

Test cases are in the format input : output.

one : 1
two : 2
three : 3
four : 4
five : 5
six : 6
seven : 7
eight : 8
nine : 9
ten : 10
eleven : 11
twelve : 12
thirteen : 13
fourteen : 14
fifteen : 15
sixteen : 16
seventeen : 17
eighteen : 18
nineteen : 19
twenty : 20
twenty-one : 21
twenty-two : 22
twenty-three : 23
twenty-four : 24
twenty-five : 25
twenty-six : 26
twenty-seven : 27
twenty-eight : 28
twenty-nine : 29
thirty : 30
thirty-one : 31
thirty-two : 32
thirty-three : 33
thirty-four : 34
thirty-five : 35
thirty-six : 36
thirty-seven : 37
thirty-eight : 38
thirty-nine : 39
forty : 40
forty-one : 41
forty-two : 42
forty-three : 43
forty-four : 44
forty-five : 45
forty-six : 46
forty-seven : 47
forty-eight : 48
forty-nine : 49
fifty : 50
fifty-one : 51
fifty-two : 52
fifty-three : 53
fifty-four : 54
fifty-five : 55
fifty-six : 56
fifty-seven : 57
fifty-eight : 58
fifty-nine : 59
sixty : 60
sixty-one : 61
sixty-two : 62
sixty-three : 63
sixty-four : 64
sixty-five : 65
sixty-six : 66
sixty-seven : 67
sixty-eight : 68
sixty-nine : 69
seventy : 70
seventy-one : 71
seventy-two : 72
seventy-three : 73
seventy-four : 74
seventy-five : 75
seventy-six : 76
seventy-seven : 77
seventy-eight : 78
seventy-nine : 79
eighty : 80
eighty-one : 81
eighty-two : 82
eighty-three : 83
eighty-four : 84
eighty-five : 85
eighty-six : 86
eighty-seven : 87
eighty-eight : 88
eighty-nine : 89
ninety : 90
ninety-one : 91
ninety-two : 92
ninety-three : 93
ninety-four : 94
ninety-five : 95
ninety-six : 96
ninety-seven : 97
ninety-eight : 98
ninety-nine : 99

Scoring

This is a code golf challenge. Your score is the number of bytes in your code. Lowest score for each language wins.

Explanations are optional, but I'm more likely to upvote answers that have one.