Write a Python program to find the greatest common divisor
of each of integers in Exercises 1 - 10 on page 258:

1. 60, 90
2. 110, 273
3. 220, 1400
4. 315, 825
5. 20, 40
6. 331, 993
7. 2091, 4807
8. 2475, 32670
9. 67942, 4209
10. 490256, 337