#include <cstdio> #include <cstring> int main() { char str_1[120], sum[200] = {0}; while (gets(str_1)) { char str[120] = {0}; int len = strlen(str_1); if (len == 1 && str_1[0] == '0') break; for (int i = 0; i < len; i++) str[i] = str_1[len - 1 - i]; for (int i = 0; i < len; i++) { int num = sum[i] + str[i] - '0'; sum[i] = num % 10; if (num > 9) sum[i+1]++; } } int kong = 150; while (!sum[--kong]); for (int i = kong; i >= 0; i--) { printf("%d", sum[i]); } printf("\n"); return 0; }