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In the computing industry, standards are established to facilitate information interchanges among American coders. Unfortunately, I’ve made communication a little bit more difficult. Can you figure this one out? 41 42 43 54 46 7B 34 35 43 31 31 5F 31 35 5F 55 35 33 46 55 4C 7D

Solution:

The string looks to be in hexadecimal.

Using an online converter you get: ABCTF{45C11_15_U53FUL}

Flag: ABCTF{45C11_15_U53FUL}