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Task/Odd-word-problem/Tcl/odd-word-problem.tcl

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+package require Tcl 8.6
+
+proc fwd c {
+    expr {[string is alpha $c] ? "[fwd [yield f][puts -nonewline $c]]" : $c}
+}
+proc rev c {
+    expr {[string is alpha $c] ? "[rev [yield r]][puts -nonewline $c]" : $c}
+}
+coroutine f while 1 {puts -nonewline [fwd [yield r]]}
+coroutine r while 1 {puts -nonewline [rev [yield f]]}
+for {set coro f} {![eof stdin]} {} {
+    set coro [$coro [read stdin 1]]
+}