gg
dd
10p
gg
:1,1s/[^1]//g
:2,2s/[^2]//g
:3,3s/[^3]//g
:4,4s/[^4]//g
:5,5s/[^5]//g
:6,6s/[^6]//g
:7,7s/[^7]//g
:8,8s/[^8]//g
:9,9s/[^9]//g
:10,10s/[^0]//g
:%s/\n//g
:wq