Decrypt this message, for which the key is unknown. The rectangle is known to be completely filled. There are 99 letters.
EOECO HENIO DAART TARTL ODFYS OVNQN AELAF SGNOP TESWP NITET IENOI EHIGI RLBIE CSTEC EFDOW ECXTR SRXSU ONCSV AIHGE PAAAnd this one, which has many Xs in. You can use this to work out how long the keyword must be, by looking at the distances between the Xs
NSGVA ENXEH THLSO XNDFP ESNIA OAGDI RXPMR YEALS AECHN TAEOU OASMU XMERE NNTXO UYART LXLCP SAECX