Write a Pandas program to stack two given series vertically and horizontally

import pandas as pd
series1 = pd.Series(range(10))
series2 = pd.Series(list('pqrstuvwxy'))
print("Original Series:")
print(series1)
print(series2)
series1.append(series2)
df = pd.concat([series1, series2], axis=1)
print("\nStack two given series vertically and horizontally:")
print(df)

Sample Output:

Original Series:
0    0
1    1
2    2
3    3
4    4
5    5
6    6
7    7
8    8
9    9
dtype: int64
0    p
1    q
2    r
3    s
4    t
5    u
6    v
7    w
8    x
9    y
dtype: object

Stack two given series vertically and horizontally:
   0  1
0  0  p
1  1  q
2  2  r
3  3  s
4  4  t
5  5  u
6  6  v
7  7  w
8  8  x
9  9  y