#include <iostream>
#include <cstring>

using namespace std;

int main()
{
    char cuv[16],s[256];
    int i,j,l,m,n,k,u=0;
    cout<<"cuv=";
    cin>>cuv;
    cout<<"s=";
    cin.get(s,256);
    cin.get();
    i=j=0;
    while(j<strlen(s))
    {
        while(s[j]!=' '&&s[j]!='\0')
            j++;
        if(cuv[0]==s[i])
        {
            k=0;
            l=i;
            while(cuv[k]==s[l]&&l<j)
            {
                k++;
                l++;
            }
        }
        if(k==strlen(cuv))
        {
            u++;
            n=strlen(s)-1;
            n++;
            for(m=n;m>=j+1;j--)
                s[m]=s[m-1];
            s[j]='?';
            s[strlen(s)]='\0';
            i=j=j+2;
        }
        else
            i=j=j+1;
    }
    if(u==0)
        cout<<"nu";
    cout<<s;





    return 0;
}