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## Learning Opportunities

This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

## Goal

The sum of a set of N integers is S.
Unfortunately, the plus signs have disappeared and the integers have been concatenated in a string O...
You have to find the positions of the plus signs to recover the addition.
If there is no solution , then print No solution, otherwise print the solution(s) in lexicographic order ( 1+11 before 11+1 ).
Input
Line 1 : An integer N as the number of terms in the addition
Line 2 : A long integer S as the sum of the N integers
Line 3 : A string O as the concatenation of the N integers
Output
If there is no solution, print No solution.
Otherwise, print the solution(s), one per line, ordered in lexicographic order (+ before 0,1,2,3...) , formatted as a valid equation a1+a2+...+aN=S
Constraints
2 <= N <= 10
Example
Input
```2
177
44133```
Output
`44+133=177`

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