purdosint

CygnusX, ky28059 You are given 22 images numbered 1 through 22. Exactly 19 were taken inside Purdue campus buildings, and 3 were taken off campus.

For each image, determine the building where it was taken. Then use the first letter of that building’s official Purdue building code as the corresponding character in the flag. For any off-campus image, use _ instead.

Read the images in numerical order (1 → 22) to obtain the flag.

Flag format: bctf{XXXXXXXXXXXXXXXXXXXXXX} (22 characters inside braces, consisting only of capital letters and underscores.)