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Mr-Worldwide

The message:

picoCTF{(35.028309, 135.753082)(46.469391, 30.740883)(39.758949, -84.191605)(41.015137, 28.979530)(24.466667, 54.366669)(3.140853, 101.693207)_(9.005401, 38.763611)(-3.989038, -79.203560)(52.377956, 4.897070)(41.085651, -73.858467)(57.790001, -152.407227)(31.205753, 29.924526)}

These clearly look like coordinates. Using Google Maps:

  • (35.028309, 135.753082): Kyota, Japan
  • (46.469391, 30.740883): Odesa, Ukraine
  • (39.758949, -84.191605): Dayto, Ohio, USA
  • (41.015137, 28.979530): Istanbul, Turkiye
  • (24.466667, 54.366669): Abu Dhabi, UAE
  • (3.140853, 101.693207): Kuala Lumpur, Malaysia
  • (9.005401, 38.763611): Addis Ababa, Ethiopia
  • (-3.989038, -79.203560): Loja, Ecuador
  • (52.377956, 4.897070): Amsterdam, Netherlands
  • (41.085651, -73.858467): Sleepy Hollow, New York, USA
  • (57.790001, -152.407227): Kodiak, Alaska, USA
  • (31.205753, 29.924526): Alexandria, Egypt

Taking first letter of every city, we get the flag: KODIAK_ALASKA