CHALLENGE 0539.E.E.1

(BOB TO EXPERTS)

38-80-04-51-11-5-77 3-38-5 3-52-04-4-77-D

10-4-1,15 77-5-11-52-80-48-91 3-52-04-11-4-D-1,15 4-8-60-75-99 16-5-99 35-52 10-52-04-4-77-D 10-4-1,15 77-5-11 52-80-48-77 35-52 10-52-04-11-4-D-1,15

CHALLENGE 0521.1.2

(BOB TO EXPERTS)

1-44-64-41 51 41-5 95-01 95-52-64-96-53-1

56-81 53-66-51-52-44-46-5 95-52-64-51-96-31

96-54-96-63-9 42-66-44-9 62-1 56-52-64-96-53-1

56-8 53-66-51-52-44-46-5 62-1 56-52-64-51-96-31 96-93-92-63-31-2 93-52-4 56-81 41-44-7

91-52-62-2 42-46-64-2 43-52-6 56-93-81-4

01421 52-44-4 62-96-4-45-2 2-53-42-52-51-96-44-46-64-8 65-93-52-66-62-2

CHALLENGE 2897.2

(BOB TO HIGH LEVEL CRYPTOGRAPHERS ALL OF THE  WORLD )

8L7C2257C3 28D7L46C42 9M61146B77

C326C11516 C118L7C221 28D326D216

C48C8L8D8Q 6L8S7F88S 116C427C8L

2358117L22

CHALLENGE 2897.1

(BOB SENT A TELEGRAM TO ALICE[A VERY IMPORTANT COMMAND] LIKE THIS...)

6C226D628C12416C439M6...

CAN YOU SOLVE IT???