import csv    
 
q = []
with open('input.csv', 'r') as r:
    with open('output.csv', 'w') as w:
        cw = csv.writer(w)
        for n in r:
            n = n.strip()
            if n:
                n = int(n)
                if len(q)!=0 and n!=(int(q[-1])+1):
                    cw.writerows(zip(map(str,q),[str(max(q))]*len(q)))
                    q.clear()
                q.append(n)
        if q:
            cw.writerows(zip(map(str,q),[str(max(q))]*len(q)))
            q.clear()
        w.write('\n')
 

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