rows = {}
columns = {}
squares = {}
ok = True
print('\n')
for i in range(0,9):
    r = raw_input();
    while r == '':
        r = raw_input();
    values = map(int, filter(lambda x: x != '', r.split(' ')))
    for j in range(0,9):
        k = values[j]
        n = str(i) + "-" + str(k)
        if n in rows.keys():
            ok = False
            print("row %i already has value %i at column %i" % (i, k, rows[n]))
        else:
            rows[n] = j
        n = str(j) + "-" + str(k)
        if n in columns.keys():
            ok = False
            print("column %i already has value %i at row %i" % (j, k, columns[n]))
        else:
            columns[n] = i
        n = str(i // 3) + "-" + str(j // 3) + "-" + str(k)
        if n in squares.keys():
            ok = False
            print("square %i-%i already has value %i at position %s" % (i // 3, j // 3, k, squares[n]))
        else:
            squares[n] = str(i) + "-" + str(j)

if ok:
    print("Sudoku checked")