sed -ne '1,/^jum/{s/^jum//p;d;}' -e p
Here is what it does:
sed -n: don't print anything unless told to1,/^jum/: for lines between the 1st one and the one that starts withjuminclusive:s/^jum//p: if you can remove "jum" at start of line, print the resultd: and proceed with next line
-e p: all other lines, just print them.