1. The problem is to find the last non-zero digit of a very large number calculated by Niloy. 2. Usually, such problems involve factorials or large products where trailing zeros appear due to factors of 10. 3. Trailing zeros come from pairs of 2 and 5 in the prime factorization. 4. To find the last non-zero digit, we ignore all factors of 10 and focus on the remaining digits. 5. Since the exact number is not given, we assume it is a factorial or product with many trailing zeros. 6. The method involves counting the number of 5s (which pair with 2s) to remove trailing zeros and then calculating the product modulo 10 ignoring zeros. 7. Without the exact number, the last non-zero digit cannot be determined precisely. 8. Please provide the exact number or expression to find the last non-zero digit.