output_description: If T satisfies the property in Problem Statement, print `Yes`; otherwise,
  print `No`.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      S
      T
attempt: s = input()
  t = input()
  ss = [
      s + "a",
      s + "b",
      s + "c",
      s + "d",
      s + "e",
      s + "f",
      s + "g",
      s + "h",
      s + "i",
      s + "j",
      s + "k",
      s + "l",
      s + "m",
      s + "n",
      s + "o",
      s + "p",
      s + "q",
      s + "r",
      s + "s",
      s + "t",
      s + "u",
      s + "v",
      s + "w",
      s + "x",
      s + "y",
      s + "z",
  ]
  if t in ss:
      print("Yes")
  else:
      print("No")
  
problem_description: Statement
  
  Takahashi wants to be a member of some web service.
  
  He tried to register himself with the ID S, which turned out to be already
  used by another user.
  
  Thus, he decides to register using a string obtained by appending one
  character at the end of S as his ID.
  
  He is now trying to register with the ID T. Determine whether this string
  satisfies the property above.
samples: [{"input": "chokudai\n    chokudaiz", "output": "Yes\n    \n\n`chokudaiz` can be obtained by appending `z` at the end of `chokudai`.\n\n* * *"}, {"input": "snuke\n    snekee", "output": "No\n    \n\n`snekee` cannot be obtained by appending one character at the end of `snuke`.\n\n* * *"}, {"input": "a\n    aa", "output": "Yes"}]