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Given a range (in the form of two integers) and a digit (0-9), you are to count how many
occurrences of the digit there are in the given range. 输入描述:
There is only one input line; it provides the range and the digit. Each integer for the range will be
between 1000 and 9999 (inclusive) and the digit will be between 0 and 9 (inclusive). Assume the
first integer for the range is not greater than the second integer for the range.
输出描述:
Print the number of occurrences of the digit in the given range.