#include <iostream>
#include <cassert>

static inline int prefix_len(const char * rhs, const char * lhs)
{
  int i = 0;
  while (rhs[i] != '\0' && lhs[i] != '\0' && rhs[i] == lhs[i])
    ++i;
  return i;
}

void usage () 
{
  cerr << "Usage: wlc c|d" << endl;
  exit(1);
}

bool get_word(istream & in, char * w) 
{
  int c;
  while (c = in.peek(), c != EOF && c <= 32) 
    in.get();
  if (c == EOF) return false;
  do {
    *w++ = static_cast<char>(in.get());
  } while (c = in.peek(), c != EOF && c > 32);
  *w = '\0';
  if (c == EOF) return false;
  else return true;
}

int main (int argc, const char *argv[]) {

  if (argc != 2)
    usage();

  if (argv[1][0] == 'c') {
    char s1[256];
    char s2[256];
    char * prev = s2;
    *prev = '\0';
    char * cur = s1;

    while (get_word(cin, cur)) {
      int i = prefix_len(prev, cur);
      if (i > 31) 
	cout << '\0';
      cout << (char)(i+1);
      cout << cur + i;
      if (cur == s1) {
	prev = s1; cur = s2;
      } else {
	prev = s2; cur = s1;
      }
    }

  } else if (argv[1][0] == 'd') {
    
    char cur[256];
    int i,c;
    while (i = cin.get(), i != -1 ) {
      if (i == 0)
	i = cin.get();
      --i;  
      while (cin.peek() > 32)
	cur[i++] = (char)cin.get();
      cur[i] = '\0';
      cout << cur << '\n';
    }
  } else {
    usage();
  }
}