Remove Special Characters

Write a program to remove special characters except alphabets from string.

C    PYTHON

#include<stdio.h>
int main() {
  char str[100];
  int i, j;
  gets(str);
  for(i=0;str[i]!='\0';i++){
    if((str[i]<'a' || str[i]>'z') && (str[i]<'A' || str[i]>'Z')){
      for(j=i;str[j]!='\0';j++)
        str[j] = str[j+1];
      i--;
    }
  }
  puts(str);
  return 0;
}

string = input()
i=0
while i<len(string):
  if (string[i]<'a' or string[i]>'z') and (string[i]<'A' or string[i]>'Z'):
    string = string[:i]+string[i+1:]
    i-=1
  i+=1
print(string)

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