It is known that the quotient of an eight-digit number divided by a is a seven-digit number with a remainder of 3, and both the tens and ones digits of the quotient are 4, so what is the tens digit of the original eight digits.
已知一个八位数被a除得的商为一个七位数，余数为3，并且商的十位数字与个位数字都是4，那么原八位的十位数字是多少．
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