#8 WA

#include<bits/stdc++.h>
using namespace std;
map <string,int> m;
string a,b,c,stk[101];
string s(int n){
	if (!n)return "0";
	string str = "";
	char c;
	while (n){
		c = (n % 10) + '0';
		str = c + str;
		n /= 10;
	}
	return str;
}
int f(const string &str){
	int len = str.length(),cnt = 0,t = 0;
	stk[0] = "";
	for (int i = 0;i < len;i++){
		if (str[i] == '['){
			stk[cnt] += '[';
			cnt++;
			stk[cnt] = "";
		}else if ('0' <= str[i] && str[i] <= '9')
			t = t * 10 + str[i] - '0';
		else if (str[i] == ']')break;
		else stk[cnt] += str[i];
	}
	while (cnt--){
		c = stk[cnt] + s(t) + ']';
		if (!m.count(c))
			return -1;
		t = m[c];
	}
	return t;
}
int main(){
	bool flag;
	string t;
	int n,i,len;
	while (cin>>a>>b){
		if (a == "int"){
			a = "";
			t = "";
			len = b.length();
			flag = 1;
			for (i = 0;i < len - 1;i++){
				if (flag)a += b[i];
				else t += b[i];
				if (b[i] == '[')
					flag = 0;
			}
			n = f(t);
			if (n == -1){
				cout<<-1;
				return 0;
			}
			for (i = 0;i < n;i++)
				m[a + s(i) + ']'] = 0;
		}else if (a == "cout"){
			n = f(b);
			if (n == -1){
				cout<<-1;
				return 0;
			}
			cout<<n<<endl;
		}else{
			c = "";
			t = "";
			len = a.length();
			flag = 1;
			for (i = 0;i < len - 1;i++){
				if (flag)c += a[i];
				else t += a[i];
				if (a[i] == '[')
					flag = 0;
			}
			a = c;
			n = f(t);
			if (n == -1){
				cout<<-1;
				return 0;
			}
			a += s(n) + ']';
			n = f(b);
			if (n == -1 || !m.count(a)){
				cout<<-1;
				return 0;
			}
			m[a] = n;
		}
	}
	return 0;
}