Add the number 3 to the first digit of a four-digit number and add the number 8 to the last digit. The resulting six-digit number is 341111 larger than the original four-digit number. What is the new six-digit number?
在一个四位数的首位添上数字3，末位添上数字8，这样得到的六位数比原来的四位数大341111，新的六位数是多少．
<result>345_678</result>