The number 12345678901234567890....890 is 4000 digit long. First you remove all the digits from the odd numbered places starting from the leftmost place. Next you remove the odd digits from the remaining 2000 digits. The same process is performed till the 4000 digit long no. reduces to single digit. What is the last digit to be removed.

1) 2000
2) 2048
3) 1048
4) 1098