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#include <stdio.h>


int main()
 {
    char *p[] = {"3697","2584"};
    int i,j;
    long num = 0;

    for(i=0;i<2;i++)
    {
        j=0;
        while(p[i][j])
        {
            if((p[i][j]-'\0')%2)
                num = 10*num + p[i][j] - '0';
            j += 1;
       }
    }
 
    printf("%ld\n",num);
}