看到别人写的很简洁

#include<bits/stdc++.h>
using namespace std;
int main()
{
	string s,num="",let="";
	cin>>s;
	for(int i=0;i<s.size();i++)
	{
		if(s[i]>='0'&&s[i]<='9') num+=s[i];
		else let+=s[i];
	}
	let+=num;
	cout<<let;
	return 0;
}