1-Compute the factorials for the numbers 0 to 20.

Print as
Number	Factorial
0	1
1	1
2	2
3	6
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2- Ask the user to enter 10 symbols and in its output print its binary sequence.

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3- Ask the user to enter the large number and print that large number in reverse order.
Note: Size of input number upto 100.

Ex.
Input:
76453819374628721

output:
12782647391835467