def get_distinct_edge(edge_array):
    """
    Return Distinct edges from edge array of multiple graphs
    >>> sorted(get_distinct_edge(edge_array))
    ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
    """
    distinct_edge = set()
    for row in edge_array:
        for item in row:
            distinct_edge.add(item[0])
    return list(distinct_edge)