Merge remote-tracking branch 'upstream/master'

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diff --git a/challenge-150/abigail/java/ch-1.java b/challenge-150/abigail/java/ch-1.java
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+++ b/challenge-150/abigail/java/ch-1.java
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+//
+// See https://theweeklychallenge.org/blog/perl-weekly-challenge-150
+//
+
+//
+// Run as: ln ch-1.java ch1.java; javac ch1.java; java ch1 < input-file
+//
+
+import java.util.*;
+
+public class ch1 {
+    public static void main (String [] args) {
+        Scanner scanner = new Scanner (System . in);
+        while (scanner . hasNextLine ()) {
+            String line = scanner . nextLine ();
+            String [] fibs = line . trim () . split (" ");
+            String fib_prev = fibs [0];
+            String fib_last = fibs [1];
+            while (fib_last . length () < 51) {
+                String fib_tmp = fib_last;
+                fib_last = fib_prev + fib_last;
+                fib_prev = fib_tmp;
+            }
+            System . out . println (fib_last . substring (50, 51));
+        }
+    }
+}