Ooops. I think I underestimated the difficulty of level 7. Other people got stuck here also. Here are some hints...
1. Pbyyrpg gur fcner terra pryy orsber rngvat rvgure fnaqjvpu
2. Lbh jvyy arrq gb pvephvg gur tevq gjvpr
3. Sbe gur svany nccebnpu tngure nyy svir pryyf gbc evtug - jvgu gur gnvy va gur pbeare