text: #include <stdio.h>
  
  
  int main(){
    int c;
  
    while((c = getchar()) != EOF){
      if(c == '\t'){
        putchar('\\');
        putchar('t');
      }
      else if(c == c){
        //putchar('\\');
        //putchar('b');
        putchar(c);
      }
      else if(c == '\\'){
        putchar('\\');
        putchar('\\');
      }
      else{
        putchar(c);
      }
    }
  }
  
  //end of code
  