Convert the following equation from infix notation to postfix notation.
3 + 4
The postfix notation of the equation `3 + 4` is `3 4 +`
Complete the following task based on the instruction and optional input provided.### Instruction:
Convert the following equation from infix notation to postfix notation.

### Input:
3 + 4

### Output:
The postfix notation of the equation `3 + 4` is `3 4 +`