BEBRAS 2026 Grade 9-10 Round 2 Ext Question 6

A rail-fence cipher writes a message in a rectangular grid of a chosen height. Starting at the top-left cell, write successive letters in a down-and-up zigzag. Then read each row left to right, from the top row downward. With height 3, ENCRYPTTHIS becomes EYHNRPTICTS as shown.



What does BEBRASWEEK become with height 4?