With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Donnie Wahlberg attended an American singing school.
text_B: Terror in the Sky is a low budget 1971 television movie remake of 1957 's Zero Hour !. 1971 in film. television movie. television movie. , which itself was based on the 1956 television play Flight into Danger .. Flight into Danger. Flight into Danger. Arthur Hailey recycled the premise in his book Runway Zero-Eight which was co-written with John Castle in 1958 .. Arthur Hailey. Arthur Hailey. Terror in the Sky starred Doug McClure , Lois Nettleton , Roddy McDowall , Leif Erickson , Kenneth Tobey , and Keenan Wynn .. Doug McClure. Doug McClure. Lois Nettleton. Lois Nettleton. Roddy McDowall. Roddy McDowall. Leif Erickson. Leif Erickson ( actor ). Kenneth Tobey. Kenneth Tobey. Keenan Wynn. Keenan Wynn
not_related.