Find all sets of positive integers $A=\big\{ a_1,a_2,...a_{19}\big\}$ which satisfy the following:
$1\big) a_1+a_2+...+a_{19}=2017;$
$2\big) S(a_1)=S(a_2)=...=S(a_{19})$ where $S\big(n\big)$ denotes digit sum of number $n$.
To solve the problem, we need to find all sets of positive integers \( A = \{a_1, a_2, \ldots, a_{19}\} \) that satisfy the following conditions:
1. \( a_1 + a_2 + \cdots + a_{19} = 2017 \)
2. \( S(a_1) = S(a_2) = \cdots = S(a_{19}) \), where \( S(n) \) denotes the digit sum of the number \( n \).

Let's denote the common digit sum by \( S(a_i) = k \).

### Case 1: \( k = 1 \)
If \( S(a_i) = 1 \), then each \( a_i \) must be a power of 10 (i.e., \( a_i = 1, 10, 100, 1000 \)) because these are the only numbers whose digit sum is 1.

We need to solve the system:
\[ 1000x + 100y + 10z + t = 2017 \]
\[ x + y + z + t = 19 \]

where \( x, y, z, t \) are non-negative integers representing the counts of 1000, 100, 10, and 1, respectively.

1. **Finding \( x \):**
   - The maximum value for \( x \) is 2 because \( 3 \times 1000 = 3000 \) which exceeds 2017.
   - If \( x = 2 \), then:
     \[ 2000 + 100y + 10z + t = 2017 \]
     \[ 100y + 10z + t = 17 \]
     \[ y + z + t = 17 \]

   - If \( x = 1 \), then:
     \[ 1000 + 100y + 10z + t = 2017 \]
     \[ 100y + 10z + t = 1017 \]
     \[ y + z + t = 18 \]

   - If \( x = 0 \), then:
     \[ 100y + 10z + t = 2017 \]
     \[ y + z + t = 19 \]

2. **Solving for \( y, z, t \):**
   - For \( x = 2 \):
     \[ 100y + 10z + t = 17 \]
     - Possible solutions: \( y = 0, z = 1, t = 7 \) (since \( 10 \times 1 + 7 = 17 \))

   - For \( x = 1 \):
     \[ 100y + 10z + t = 1017 \]
     - Possible solutions: \( y = 10, z = 1, t = 7 \) (since \( 100 \times 10 + 10 \times 1 + 7 = 1017 \))

   - For \( x = 0 \):
     \[ 100y + 10z + t = 2017 \]
     - Possible solutions: \( y = 20, z = 1, t = 7 \) (since \( 100 \times 20 + 10 \times 1 + 7 = 2017 \))

### Case 2: \( k = 10 \)
If \( S(a_i) = 10 \), we consider the first 19 numbers with a digit sum equal to 10, i.e., \( 19, 28, 37, \ldots, 181, 190 \).

1. **Sum of these numbers:**
   \[ 19 + 28 + 37 + \cdots + 190 \]
   - This is an arithmetic series with the first term \( a = 19 \), common difference \( d = 9 \), and 19 terms.
   - Sum of the series:
     \[ S = \frac{n}{2} \left(2a + (n-1)d\right) \]
     \[ S = \frac{19}{2} \left(2 \times 19 + 18 \times 9\right) \]
     \[ S = \frac{19}{2} \left(38 + 162\right) \]
     \[ S = \frac{19}{2} \times 200 \]
     \[ S = 1900 \]

2. **Adjusting the sum to 2017:**
   - We need to add 117 to one of these numbers to make the total sum 2017.
   - Choose one number, say 19, and add 117 to it:
     \[ 19 + 117 = 136 \]
   - The new set is \( \{136, 28, 37, \ldots, 190\} \).

### Conclusion:
The sets of positive integers \( A \) that satisfy the given conditions are:
1. \( \{1000, 1000, 10, 7, 1\} \) with \( S(a_i) = 1 \)
2. \( \{136, 28, 37, \ldots, 190\} \) with \( S(a_i) = 10 \)

The final answer is \( \boxed{ \{1000, 1000, 10, 7, 1\} } \) and \( \{136, 28, 37, \ldots, 190\} \)