Each of the digits in the number $7148356$ is arranged in ascending order from left to right. The position of how many digits will remain unchanged as compared to that in the original number?

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**Solution:**

1. Original number: $7 1 4 8 3 5 6$

2. Arrange digits in ascending order: $1 3 4 5 6 7 8$

3. Compare each digit's position in original and arranged number:
   - Position 1: Original digit = 7, Arranged digit = 1 (changed)
   - Position 2: Original digit = 1, Arranged digit = 3 (changed)
   - Position 3: Original digit = 4, Arranged digit = 4 (unchanged)
   - Position 4: Original digit = 8, Arranged digit = 5 (changed)
   - Position 5: Original digit = 3, Arranged digit = 6 (changed)
   - Position 6: Original digit = 5, Arranged digit = 7 (changed)
   - Position 7: Original digit = 6, Arranged digit = 8 (changed)

4. Only the digit '4' at position 3 remains in the same position.

**Answer:** One

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