def READ(str string) string {
  return str
}

def EVAL(ast string, env StringMap<string>) string {
  return ast
}

def PRINT(exp string) string {
  return exp
}

def REP(str string) string {
  return PRINT(EVAL(READ(str), {}))
}

@entry
def main {
  var line string
  while (line = readLine("user> ")) != null {
    if line == "" { continue }
    printLn(REP(line))
  }
}