ITS REALLY HARD
I WORK SO HARD FOR THIS PROBLEM TO DO ITS REALLY FAST, U HAVE 1MB MEMORY input THIS IS ABOUT 600-700k symbols, U NEED TO DO ITS Very VERY VERY VERYVERY VERy fAST AND THIS VERYV VEryV eVEYR Very HARD
U NEED TO READ THIS NEVER NEVER NEVER USE CIN
USE c=getchar() where c - char. And IF U WANT TO STOP INPUT JUST int WHILE
in the conditions of the while loop, put restrictions on the symbol, that is, there are all charms from A to Z and something else. AND THEN YOU NEED A REALLY FAST ALGORITHM
I rewrote mine six times, I can't understand it myself, it's very difficult, I only remember that char is int, and int is a deadline, and diffirintly THE ALGORITHM is SLOW