=== Original string analysis ===
String: EXCepisfYvbAScaS
Length: 16 characters

=== Base64 decode attempt ===

=== ROT13 decode ===
RKPrcvfsLioNFpnF

=== Reversed string ===
SacSAbvYfsipeCXE

=== Uppercase letters only ===
EXCYASS

=== Lowercase letters only ===
episfvbca

=== Python analysis ===
Original: EXCepisfYvbAScaS
Length: 16
Uppercase chars: ['E', 'X', 'C', 'Y', 'A', 'S', 'S']
Lowercase chars: ['e', 'p', 'i', 's', 'f', 'v', 'b', 'c', 'a']
Upper positions: [0, 1, 2, 8, 11, 12, 15]
Lower positions: [3, 4, 5, 6, 7, 9, 10, 13, 14]
Base64 decode (pad=''): b'\x11p\x9e\xa6+\x1fb\xf6\xc0I\xc6\x92'
Base64 decode (pad='='): b'\x11p\x9e\xa6+\x1fb\xf6\xc0I\xc6\x92'
Base64 decode (pad='=='): b'\x11p\x9e\xa6+\x1fb\xf6\xc0I\xc6\x92'
Base64 decode (pad='==='): b'\x11p\x9e\xa6+\x1fb\xf6\xc0I\xc6\x92'
Uppercase only: EXCYASS
Lowercase only: episfvbca
ROT13: RKPrcvfsLioNFpnF
Not valid hex

=== Caesar cipher shifts ===
Shift 19: xqvxiblyroutlvtl