Case #1: The actual year is 2141. Case #2: Unknown bugs detected. Case #3: The actual year is 1938. Case #4: The actual year is 1938. Case #5: The actual year is 12. Case #6: The actual year is 100. Case #7: Unknown bugs detected. Case #8: The actual year is 101. Case #9: Unknown bugs detected. Case #10: The actual year is 9998. Case #11: The actual year is 9999. Case #12: Unknown bugs detected. Case #13: The actual year is 0. Case #14: The actual year is 71. Case #15: The actual year is 9999. Case #16: The actual year is 1942. Case #17: The actual year is 2620. Case #18: The actual year is 2000. Case #19: The actual year is 9999. Case #20: Unknown bugs detected.