# Write a function to sort the tuples alphabetically by the first item of each tuple.
def sort_tuple(tup):
    n = len(tup)
    for i in range(n):
        for j in range(n - i - 1):
            if tup[j][0] > tup[j + 1][0]:
                tup[j], tup[j + 1] = tup[j + 1], tup[j]
    return tup
