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Competitions

# Number of digits

Given a string that contains an expression of numbers, signs of arithmetic operations and brackets. Find the number of digits used in the expression.

#### Input data

Arithmetic expression containing numbers, brackets, and arithmetic characters.

#### Output

Print the number of digits in the expression.

Time limit 1 second
Memory limit 128 MiB
Input example #1
9*8+76-54/3+2**10

Output example #1
10

Author Matviychuk Sergiy Volodymyrovych
Source "ABC programming"