Answer Posted / xxx

Since I assume this is a COBOL question (and not JCL), I have tried below code.
-------------------------------------------------------

OPEN INPUT DASA
OPEN OUTPUT DASB DASC

INITIALIZE WS-NUM.
MOVE 'N' TO WS-EOF-SW.
READ DASA INTO WS-NUM
AT END MOVE 'Y' TO WS-EOF-SW
END-READ

PERFORM UNTIL WS-EOF-SW = 'Y'
DIVIDE WS-NUM BY 2 GIVING WS-Q REMAINDER WS-R
IF WS-R = 1
WRITE DASB-RCD FROM WS-NUM
ELSE
WRITE DASC-RCD FROM WS-NUM
END-IF
READ DASA INTO WS-NUM
AT END MOVE 'Y' TO WS-EOF-SW
END-READ
END-PERFORM


CLOSE DASA DASB DASC

STOP RUN
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