#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    getline(cin, s);

    string result = "";

    int i = 0;
    while (i < s.length()) {
        if (s[i] == '-') {
            // 检查是否可以展开
            if (i > 0 && i < s.length() - 1) {
                char left = s[i-1];
                char right = s[i+1];

                // 类型一致：都为数字或都为小写字母
                bool is_digit = (left >= '0' && left <= '9') && (right >= '0' && right <= '9');
                bool is_lower = (left >= 'a' && left <= 'z') && (right >= 'a' && right <= 'z');

                if (is_digit || is_lower) {
                    if (right > left) {
                        // 展开：从 left 到 right
                        for (char c = left + 1; c <= right; ++c) {
                            result += c;
                        }
                        // 跳过 '-' 和 right
                        i += 2;
                        continue;
                    }
                }
            }
            // 不满足条件，保留 '-'
            result += '-';
        } else {
            result += s[i];
        }
        i++;
    }

    cout << result << endl;
    return 0;
}