#include <bits/stdc++.h>
                            #include<iostream>
                            #include<cstdio>
                            #include<vector>
                            #include<queue>
                            #include<map>
                            #include<cstring>
                            #include<string>
                            #include <math.h>
                            #include<algorithm>
                        //    #include <boost/multiprecision/cpp_int.hpp>
                            #include<functional>
                 //    #define int long long
                            #define inf  1000000007
                            #define pa pair<int,int>
                            #define ll long long
                            #define pal pair<double,pa>
                            #define ppa pair<pa,int>
                            #define ppap pair<int,pa>
                            #define ssa pair<string,int>
                            #define  mp make_pair
                            #define  pb push_back
                            #define EPS (1e-10)
                            #define equals(a,b) (fabs((a)-(b))<EPS)
                     
                            using namespace std;
                     //priority_queue<int, vector<int>, greater<int> > que;
                            class Point{
                            	public:
                            	double x,y;
                            	Point(double x=0,double y=0):x(x),y(y) {}
                            	Point operator + (Point p) {return Point(x+p.x,y+p.y);}
                            	Point operator - (Point p) {return Point(x-p.x,y-p.y);}
                            	Point operator * (double a) {return Point(x*a,y*a);}
                            	Point operator / (double a) {return Point(x/a,y/a);}
                            	double absv() {return sqrt(norm());}
                            	double norm() {return x*x+y*y;}
                            	bool operator < (const Point &p) const{
                            		return x != p.x ? x<p.x: y<p.y;
                            	}
                            	bool operator == (const Point &p) const{
                            		return fabs(x-p.x)<EPS && fabs(y-p.y)<EPS;
                            	}
                            };
                            typedef Point Vector;
                     
                            struct Segment{
                            Point p1,p2;
                            };
                     
                        double hen(Vector a){
                        if(fabs(a.x)<EPS && a.y>0) return acos(0);
                        else if(fabs(a.x)<EPS && a.y<0) return 3*acos(0);
                        else if(fabs(a.y)<EPS && a.x<0) return 2*acos(0);
                        else if(fabs(a.y)<EPS && a.x>0) return 0.0;
                        else if(a.y>0) return acos(a.x/a.absv());
                        else return 2*acos(0)+acos(-a.x/a.absv());
                     
                        }
                     
                string itos( int i ) {
                ostringstream s ;
                s << i ;
                return s.str() ;
                }
                 
                int gcd(int v,int b){
                	if(v>b) return gcd(b,v);
                	if(v==b) return b;
                	if(b%v==0) return v;
                	return gcd(v,b%v);
                }
                            double dot(Vector a,Vector b){
                            	return a.x*b.x+a.y*b.y;
                            }
                            double cross(Vector a,Vector b){
                            	return a.x*b.y-a.y*b.x;
                            }
                        
                double distans(double x1,double y1,double x2,double y2){
                	double rr=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
                	return sqrt(rr);
                	
                }
                /*}
int pr[100010];
//int inv[100010];
 
int beki(int wa,int rr){
	if(rr==0) return 1ll;
	if(rr==1) return wa;
	if(rr%2==1) return (beki(wa,rr-1)*wa)%inf;
	int zx=beki(wa,rr/2);
	return (zx*zx)%inf;
}
  
void gya(){
	pr[0]=1;
	for(int i=1;i<100010;i++){
		pr[i]=(pr[i-1]*i)%inf;
	}
	for(int i=0;i<100010;i++) inv[i]=beki(pr[i],inf-2);
	
}

*/

                         //----------------kokomade tenpure------------

int a[100];
string s;

string dfs(int hi,int mi){
	string z;
	if(hi>mi) return "";
	if(hi==mi) return s.substr(hi,1);
	
	if(s[hi]=='+'){
		z=dfs(hi+1,mi);
		if(z[0]<'Z')z[0]++;
		else z[0]='A';
		return z;
	}
	if(s[hi]=='-'){
		z=dfs(hi+1,mi);
		if(z[0]>'A')z[0]--;
		else z[0]='Z';
		return z;
	}
	if(s[hi]=='['){
	//	cout<<"r"<<endl;
		int u=a[hi];
		z=dfs(hi+1,u-1);
	//	cout<<hi+1<<" "<<u-1<<endl;
	//	cout<<z<<endl;
		reverse(z.begin(),z.end());
		return z + dfs(u+1,mi);
	}
//	cout<<"hi "<<hi<<" "<<mi<<endl;
	return s.substr(hi,1)+dfs(hi+1,mi);
}
signed main(){
	int n,m,r,w,h,x,y,wa;
	
/*
	cin>>n>>w>>h;
	for(int i=0;i<n;i++){
		cin>>x>>y>>wa;
		
		a[max(x-wa+1,1)]++;
		a[min(x+wa+1,w+1)]--;
		b[max(y-wa+1,1)]++;
		b[min(y+wa+1,h+1)]--;
	}
	bool bb=true,bb2=true;
	for(int i=1;i<=w;i++){
		a[i] += a[i-1];
		if(a[i]==0) bb=false;
	}
	for(int i=1;i<=h;i++){
		b[i]+=b[i-1];
		if(b[i]==0) bb2=false;
	}
	
	if(bb||bb2)cout<<"Yes"<<endl;
	else cout<<"No"<<endl;
	*/
	
	while(1){
	//	string s;
	//	int na,nb;
	cin>>s;
		if(s==".") return 0;
		int l=s.length();
		stack<int> st;
		vector<int> ha;
		for(int i=0;i<l;i++){
			if(s[i]=='[') st.push(i);
			if(s[i]==']'){
				int y=st.top();
				st.pop();
				a[y]=i;
				a[i]=y;
			//	cout<<i<<" "<<a[i]<<" "<<endl;
			}
			if(s[i]=='?') ha.pb(i);
		}
		
		if(ha.size()==0){
			//cout<<"s"<<endl;
			//return 0;
			cout<<dfs(0,l-1)<<endl;
		}
		
		else{
			vector<string> ve;
			while(ha.size()<3)ha.pb(ha[0]);
			for(int i=0;i<26;i++)for(int j=0;j<26;j++)for(int k=0;k<26;k++){
				s[ha[0]]='A'+i;
				s[ha[1]]='A'+j;
				s[ha[2]]='A'+k;
				ve.pb(dfs(0,l-1));
			}
			sort(ve.begin(),ve.end());
			cout<<ve[0]<<endl;
			
		}
		
	}
	
	
	
	return 0;
}

Measured memory_bytes: 5280