this

代码：

#include<bits/stdc++.h>
using namespace std;
int main()
{	
	string a;
	int ans=0,chang=0;
	cin>>a;
	chang=a.size();
	for(int i=0;i<chang;i++)
	{
		if(a[i]-48==0)
		cout<<"X";
		else if(a[i]=='(')
		{
			ans=a[i-1]-48;
			for(int j=0;j<ans;j++)
			cout<<a[i+1];
		}
		else if(a[i]==')')
		cout<<"";
		else if(a[i]>='A'&&a[i]<='Z'||a[i]>='a'&&a[i]<='z')
		cout<<a[i];
		else
		{
		if(a[i+1]!='(')
		cout<<a[i]-48-1;
		}
	}
	return 0;
}