class M{
static String c
(String s
){return s.
replaceAll("(.)\\1?",
"$1$1");}
public static void main
(String[] a
){ System.
out.
println(c
("AABBCCDDEFFGG")); System.
out.
println(c
("AAAABBBCCCCDD")); System.
out.
println(c
("AAABBBCCCCDDDD")); System.
out.
println(c
("AAAAAAA")); System.
out.
println(c
("OOQQO")); System.
out.
println(c
("ABBB")); System.
out.
println(c
("ABBA")); }
}
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