Write a Python program to add leading zeroes to a string.

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str1='122.22'
print("Original String: ",str1)
print("\nAdded trailing zeros:")
str1 = str1.ljust(8, '0')
print(str1)
str1 = str1.ljust(10, '0')
print(str1)
print("\nAdded leading zeros:")
str1='122.22'
str1 = str1.rjust(8, '0')
print(str1)
str1 = str1.rjust(10, '0')
print(str1)