#include <fstream>
#include <string>
#include <cstring>
using namespace std;
string wrong="";
string measured(string x,char y)
{
	int num;
	
	for(int i=0;i<x.length();i++)
	{
		if(x[i]==y)
		{
			num=i;
			break;
		}
	}
	x.erase(num,1);
	return x;
}
string measurei(string x,char y,char z)
{
	int num;
	for(int i=x.length()-1;i>=0;i--)
	{
		if(x[i]==y)
		{	num=i;
		    break;
		}
	}
	x.insert(num,1,z);
	return x;
}
string measurer(string x,char y,char z)
{int count=0;

	for(int i=0;i<x.length();i++)
	{
		if(x[i]==y)
			x[i]=z;
		count++;
	}
	if(count!=0)
        return x;
	else
		return wrong;
}
int main()
{
	ifstream fin("edit.in");
	ofstream fout("edit.out");
	char b[41];string a;char object,object1;
	char word;
	fin.getline(b,'/n');
	for(int k=0;k<=strlen(b);k++)
		a+=b[k];
	fin>>word;
	if(word=='D')
	{
		fin>>object;
		fout<<measured(a,object)<<endl;
	}
	if(word=='I')
	{
		fin>>object>>object1;
		fout<<measurei(a,object,object1)<<endl;
	}
	if(word=='R')
	{
		fin>>object>>object1;
		if(measurer(a,object,object1)==wrong)
			fout<<"error"<<endl;
		else
			fout<<measurer(a,object,object1)<<endl;
		
	}
	fin.close();
	fout.close();
	return 0;
}