#include <iostream>
#include <cstdio>
#include <iomanip>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <bitset>
#include <stack>
#include <utility>
#include <numeric>
#include <algorithm>
#include <functional>
#include <cctype>
#include <complex>
#include <string>
#include <sstream>
#include <fstream>
#include <cassert>
using namespace std;

//common

typedef int  i32;
typedef long long i64,ll;
typedef long double ld;

#define BR "\n"
#define ALL(c) (c).begin(),(c).end()
#define REP(i,n) for(int i=0;i<(int)(n);++i)
#define FOR(i,l,r) for(int i=(int)l;i<(int)(r);++i)
#define EACH(it,o) for(auto it = (o).begin(); it != (o).end(); ++it)
#define IN(l,v,r) ((l)<=(v) && (v)<(r))

//config
//#define NDEBUG
//#define INF 1<<30
//#define EPS 1e-8
//const ll MOD =100000007;

//debug
#ifdef NDEBUG
#define DUMP(x)
#define DUMPLN(x)
#define DEBUG(x)
#define DEBUGLN(x)
#define LINE()
#define LINELN()
#define CHECK(exp,act)
#define STOP(e)
#else
#define DUMP(x)  cerr << #x << " = " << (x)
#define DUMPLN(x)  DUMP(x) <<endl
#define DEBUG(x) DUMP(x) << LINE() << " " << __FILE__
#define DEBUGLN(x) DEBUG(x)<<endl
#define LINE()    cerr<< " (L" << __LINE__ << ")"
#define LINELN()    LINE()<<endl
#define CHECK(exp,act)  if(exp!=act){DUMPLN(exp);DEBUGLN(act);}
#define STOP(e)  CHECK(e,true);if(!(e)) exit(1);
#endif

template<class T> inline string toString(const vector<T>& x) {
	stringstream ss;
	REP(i,x.size()){
		if(i!=0)ss<<" ";
		ss<< x[i];
	}
	return ss.str();
}

template<class T> inline string toString(const vector<vector<T> >& map) {
	stringstream ss;
	REP(i,map.size()){
		if(i!=0)ss<<BR;
		ss<< toString(map[i]);
	}
	return ss.str();
}
template<class K,class V>  string toString(map<K,V>& x) {
	string res;stringstream ss;
	for(auto& p:x)ss<< p.first<<":" << p.second<<" ";
	return ss.str();
}

string BITtoString(int bit){
    stringstream ss;
    while(bit!=0){ss<<(bit%2);bit/=2;}
    string res=ss.str();reverse(ALL(res));
    return res;
}

template<typename T,typename V> inline T pmod(T v,V MOD){
	return (v%MOD+MOD)%MOD;
}
#define nextInt(n) scanf("%d",&n)
#define defInt(n) int n;nextInt(n)
#define nextLong(n) scanf("%lld",&n)
#define defLong(n) ll n;nextLong(n)
#define nextDouble(n) scanf("%lf",&n)


string str;
bool over;string ans;
int p;

namespace SyntaxAnalysis{
	typedef string::const_iterator Cursor;

//			l.erase(remove(l.begin(), l.end(), ' '), l.end());//空白除去
	
	class ParseError{};
	
	string expression(Cursor&);int number(Cursor&);
	string seq(Cursor&);

	// <四則演算の式> ::= <乗算除算の式> (+ or -) <乗算除算の式> (+ or -) ...
	string expression(Cursor &c){
		string res="";
		if(over)return res;
		int v=1;
		while(c!=str.end() && *c!=')'){
			if(*c=='('){
				c++;// (
				string data=expression(c);
				REP(i,v){
					res+=data;
					if(p<=(int)res.size()-1){
						over=true;ans=res[p];
						return res;
					}
				}
				c++;// )
				v=1;
			}else if(isdigit(*c)){
				v=number(c);
			}else{//文字
				string data(1,*c);c++;
				REP(i,v){
					res+=data;
					if(p<=(int)res.size()-1){
						over=true;ans=res[p];
						return res;
					}
				}
				v=1;
			}
		}
		return res;
	}

	// <数>           ::= (0|1|2|3|4|5|6|7|8|9)+
	int number(Cursor &c){
	    stringstream ss;
	    while(isdigit(*c)){
	        ss << *c;c++;
	    }
	    int ret;ss >> ret;
	    return ret;
	}

	// <文字>
	string seq(Cursor &c){
	    stringstream ss;
	    while(isupper(*c)){
	        ss << *c;c++;
	    }
	    return ss.str();
	}

}
using namespace SyntaxAnalysis;

class Main{
	public:

	int N;

	void run(){
		// ifstream cin("D2");
//		ofstream cout( "D2.out" );
		
		while(true){
			over=false;ans="";
			cin >> str;if(str=="0")break;
			cin >> p;
			Cursor c=str.begin();
			expression(c);
			if(!over)cout << 0 <<endl;
			else cout <<ans <<endl;
		}
	}


};
int main(){
	cout <<fixed<<setprecision(15);	
	ios::sync_with_stdio(false);
	Main().run();
	return 0;
}

Measured memory_bytes: 6900