4sem-8-2

#include <iostream>
#include <string>
#include <cctype>

char free_reading() {
    char symb;
    while((symb = (char)getchar()) != EOF && !isspace(symb));
    return symb;
}

char space_reading() {
    char symb;
    while((symb = (char)getchar()) != EOF && isspace(symb));
    return symb;
}

char reading(int &k0, int &m1, int &is_word, int flag) {
    is_word = 1;
    char symb;
    //flag == 0 while symb == '0', then flag = 1
    while((symb = (char)getchar()) != EOF && !isspace(symb)) {
        if(symb != '1' && symb != '0') {
            symb = free_reading();
            is_word = 0;
            break;
        } else if(!flag && symb == '1') {
            flag = 1;
            m1++;
        } else if(!flag) {
            //symb == '0'
            k0++;
        } else if(symb == '1') {
            //flag == 0
            m1++;
        } else {
            //flag == 1
            //symb == '0'
            break;
        }
    }
    return symb;
}

void check() {
    char symb;
    int is_word, k = 0, m = 0, k2, m2;
    //flag == 0 while reading first 0^k 1^m, then flag == 1

    symb = space_reading();
    if(symb == EOF) throw(-1);
    if(symb != '0' && symb != '1') {
        if(!isspace(symb)) symb = free_reading();
        if(symb == EOF) throw(-2);
        throw(0);
    } else if (symb == '0') {
        k = 1;
        symb = reading(k, m, is_word, 0);
    } else {
        m = 1;
        symb = reading(k, m, is_word, 1);
    }
    if(!is_word) {
        if(symb == EOF) throw(-2);
        if(!isspace(symb)) free_reading();
        throw(0);
    }
    if(symb == EOF) throw(-3);
    if(isspace(symb)) throw(1);

    while(symb != EOF && !isspace(symb)) {
        k2 = 0;
        m2 = 0;
        if(symb != '0' && symb != '1') {
            throw(0);
        } else if (symb == '0') {
            k2 = 1;
            symb = reading(k2, m2, is_word, 0);
        } else {
            m2 = 1;
            symb = reading(k2, m2, is_word, 1);
        }
        if(!is_word || k != k2 || m != m2) {
            if(symb == EOF) throw(-2);
            if(!isspace(symb)) symb = free_reading();
            if(symb == EOF) throw(-2);
            throw(0);
        }
        if(symb == EOF) throw(-3);
        if(isspace(symb)) throw(1);
    }
    if(symb == EOF) throw(-3);
    if(isspace(symb)) throw(1);
}

int main()
{
    std::string word;
    while(1) {
        try {
            check();
        } catch(int flag) {
            //flag < 0 when EOF:
            //flag == -1 when no word
            //flag == -2 when the word is not from language
            //flag == -3 when the word is from language
            //flag == 0 when the word is not from language
            //flag == 1 when the word is from language
            if(flag == -1) break;
            if(flag == -2) {
                std::cout<<0<<std::endl;
                break;
            }
            if(flag == -3) {
                std::cout<<1<<std::endl;
                break;
            }
            std::cout<<flag<<std::endl;
        }
    }
    return 0;
}